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.
[[74, 21, 91, 83], [-178, 100, -81, -59, -88, -69], [64, -33, 58, -182, -31, 29], [-189, 36, 5, -58], [5, 53, -73, -70], [-158, 40]]