Eliminate three values from the listed data {1, 2, 3, 4, -6, -2, -1, 5} starting from the fourth index. To achieve this in Power Query, use the MList.RemoveRange function with the parameters ({1, 2, 3, 4, -6, -2, -1, 5}, 4, 3). The resulting output will be {1, 2, 3, 4, 5}.