Rather than have us blindly prepare a file for you, why dont you upload a sample file(s) for us to work with. In this manner, we will not have to guess at what your data looks like. Then for the file(s) submitted prepare a mocked up solution of what your file product should look like.
Without an example of your data, then perhaps
Code:
let
T1 = Excel.CurrentWorkbook(){[Name="Table1"]}[Content],
T2 = Excel.CurrentWorkbook(){[Name="Table2"]}[Content],
T3 = Excel.CurrentWorkbook(){[Name="Table3"]}[Content],
T4= Table.Combine({T3,T1,T2})
in
T4