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.
[[4, -172, 63], [-165, -5, 58, -29, -166, 57], [-162, -171, 54, -15], [99, -121, -126, -181], [-2, -11, -163], [-158, -49, 37, -138, -1], [-61, -40, -79, -21]]