Should one who missed the Asr prayer and entered the mosque after Maghrib to make it up, raise his voice with the takbeerat al-intiqal in his fourth rak'ah, knowing that the congregants are praying Maghrib? And should he recite aloud or silently in the first two rak'ahs?

Performing the Asr (Afternoon) prayer after Maghrib (Sunset) prayer is considered a make-up (qada') prayer. The majority of scholars hold that a missed prayer cannot be performed behind a current prayer, or vice versa, in contrast to the Shafi'is who permit this. However, according to the Shafi'is, the follower (ma'mum) must leave the imam when the imam stands for the fourth rak'ah, then sit for the tashahhud and say the taslim individually. Regarding the imam's audible recitation in the first two rak'ahs in this situation, there is a difference of opinion, and some scholars have preferred silent recitation. It is desirable for the imam to say the takbirat (allahu akbar) for transitions audibly as long as there are followers behind him. If he remains alone in the fourth rak'ah, the ruling for an individual praying alone applies to him, for whom silent recitation is desirable.