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.
[[51, -35, 81, -119, -4], [-87, 27, -39, -170, -89], [-107, -180, -87, -106, 10, -51, 15], [-139, -19, -118, -119, -189]]