How to Create an Index for every Nth Row in Power Query

There doesn't appear to be a native way to create an index that will only add the increment every nth row. So this video walks through the workaround I did to produce it.

[frankb]

Have you tried manipulating the increment when adding and index column.

= Type", "Index", 1, 1/4, Int64.Type)

You can then change type to a 'Whole Number' or use the Round function.