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.
[[-31, 16, -5, -63], [-65, 58, 35, 93, 29, -5], [61, 68, -76, -139, -106, -99, 70], [-47, 59, 16, -161, 51]]