In this task, you are given a list. This list contains many lists of integers. The list is several items written within a []. Your task is to find the maximum number among the members of each inner list. The output should be a list comprised of the maximums with the same order as the internal lists.
[[-29, -151, 18, -15, -20, 21], [97, 1, -57], [18, 83, -60, -178, -78, -126, 89]]