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, -139], [-113, 72, 88, -95, -146, -186], [31, -151, -171, -180, -87, -12, -181]]