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.
[[-55, -189], [-2, 22, 78, -199], [-89, 18], [-3, -47, -21], [69, -6, 5, -89, 99], [44, -170, -3, 67, -90, -71, 57]]