What is the ruling on a person

Q: How should a person, who catches only one Rak`ah (unit of Prayer) of the congregation of `Isha' (night) Salah (prayer), make up for the three Rak`ahs he missed?

A: A person who catches only one Rak`ah of the congregation of `Isha' (night) Salah (prayer) has to make up for the three Rak`ahs he missed after the Imam says the two times of Taslim (salutation of peace ending the Prayer). Following is how: Such a person is to perform his second Rak`ah reciting, while standing, Surah Al-Fatihah and another portion of the Qur'an and sit at its end to say the first Tashahhud (a recitation in the sitting position in the second unit of Prayer). One should then get up to perform the third Rak`ah reciting, while standing, Surah Al-Fatihah only without sitting to say Tashahhud. One should then get up to perform the fourth Rak`ah reciting, while standing, Surah Al-Fatihah only and sit at the end of the Rak`ah to say the last Tashahhud, on finishing which one should say Taslim.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.