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.
[[-58, -176, 95, -113, 67, -164], [97, 98, -87, 68], [57, 21, 86]]