The ruling on reciting aloud in the prayer that a latecomer makes up
Machine translationRead the Arabic original
Question:
And I told you to pray with the congregation, and I did not find the last rak'ah, so you pray the second rak'ah, testifying that
Answer:
If you recite it aloud, it is a recommended practice (sunnah); if you do not recite it aloud, it is not obligatory. If you recite it aloud considering it to be your second rak'ah, this is a recommended practice (sunnah). If you recite it quietly, we do not know, because reciting aloud and reciting quietly are recommended practices (sunnah) in the prayer.
And I told you to pray with the congregation, and I did not find the last rak'ah, so you pray the second rak'ah, testifying that
Answer:
If you recite it aloud, it is a recommended practice (sunnah); if you do not recite it aloud, it is not obligatory. If you recite it aloud considering it to be your second rak'ah, this is a recommended practice (sunnah). If you recite it quietly, we do not know, because reciting aloud and reciting quietly are recommended practices (sunnah) in the prayer.
Source
شرح ثلاثة الأصول وأدلتها، معرفة دين الإسلام بالأدلة - أركان الإسلام وبيانها بأدلتها — islamhouse.com (1:24:05)
The Arabic text is a machine transcription of the audio recording.