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.
[[-154, 100, 9, -11, -21, 53, 23], [-53, 63, -128, 52, -16, -56], [-172, -89]]