In Jain tradition, Mahavir Swami’s 4th previous birth is described as Priyamitra Chakravarti. I could not find any authentic Jain source that gives a specific height for that birth. The commonly mentioned height belongs to his final birth as Mahavir Swami, not to the 4th previous birth. ( jainworld.jainworld.com)

So, the safest Jain answer is: no standard height is recorded for Mahavir Swami in his 4th birth.