If a worshiper catches the fourth rak'ah of the 'Isha' prayer with the congregation, does he complete it aloud or silently?

Question : May Allah reward you and grant you reward. If a worshiper catches the last rak'ah of the 'Isha' prayer with the congregation, does he recite aloud and then silently when he stands to complete his prayer?

Answer : First, we must know that the prayers recited aloud include both the night prayers and the day prayers. It is not hidden from us that among the day prayers, some are recited aloud, such as Jumu'ah, the two 'Eids, and the eclipse prayer. Yes. And whatever is prescribed for general congregation, even if it is during the day, is recited aloud.
Aloud. The ruling in this matter is that the unity of the congregation is more apparent in the recitation aloud than in the recitation silently. Yes. Do you agree with this? The unity among the worshippers is more apparent in the recitation aloud than in the silent prayer. Do you agree with this? Yes, because they listen to one imam. In the silent prayer, each person attends to himself. For this reason, it is prescribed to recite aloud in the day prayers if they are prayers for which people gather. Pay attention, my brother. People gather for Jumu'ah, people gather for the two 'Eids, 'Id al-Fitr and 'Id al-Adha, and people gather for the eclipse, yes? The prayer for rain, yes, like the 'Eid. The default for the eclipse prayer is that it be in the congregational mosques, in the main mosque. But the practice of people now is that each one prays in his own mosque, which is contrary to what is best. For this reason, the scholars stated that the best is for the eclipse prayer to be in the main mosque. The Prophet (peace and blessings be upon him) gathered the people for the eclipse prayer when the sun was eclipsed during the time of the Messenger (peace and blessings be upon him). How many times was it eclipsed? Ten times or five? Yes, once. It was recorded as once, and the people were frightened by it. So he ordered a caller to call, "The prayer is gathered." The people gathered and he prayed with them. I say, the prayer recited aloud, whether it is a day prayer or a night prayer, the imam recites aloud in it. As for the ma'mum, what is prescribed for him is to listen to his imam's recitation, except for al-Fatihah, which he must recite even if the imam is reciting it. Yes. As for the one praying alone in a prayer recited aloud, the scholars (may Allah have mercy on them) mentioned that a person has a choice: if he wishes, he recites aloud, and if he wishes, he recites silently, unless his reciting aloud causes disturbance.
So it is better that he recite silently. So, this is the one who caught one rak'ah of the 'Isha' prayer and stands to make up the missed part. We tell him now: you have one rak'ah remaining in the recitation aloud. So when you stand to make up, if you wish, you recite aloud, and if you wish, you recite silently, as long as you do not cause disturbance. And what is your opinion now, if he recites aloud, does it disturb the people or not? It appears that it would cause disturbance. So it is better that his recitation be silent. But.
When does he perform the first tashahhud, after two rak'ahs of making up or after one rak'ah? After one rak'ah, because the Messenger (peace and blessings be upon him) said with His blessing