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.
[[84, -86, 87, -13, 3, -132, 58], [41, -141, -89], [45, 53, 6, -87]]