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.
[[72, 30, 92, -13, -121, -132], [-58, -179], [-95, -158, -163, -187], [-140, -90, 21]]