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.
[[81, -28, -199, -163], [-22, -115, -59, -175], [22, -20, -185, -67, 31]]