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.
[[-166, -8, -51, -7, -91], [-44, -160, 83, -104], [-142, 1, 20, 9, -99, 55, -181], [-74, -199, -38, -31, -32, 31]]