Get LastNonBlank Value across all rows

Hi there I wonder if someone could help me out.

If you can refer to the image below.



What I want is the Value from the ZCALC Rowz (30/06/2019) to be repeated. As is shown the the example in the ZCALC ROwz column (1/07/2020)

The trick here is that I have got a Fiscal Year Slicer, so if I click on Fiscal Year 2019-20 then I want the repeated value to change from 30/06/2019 to be 30/06/2020 for all the rows in the table.

Any help or suggestions will be appreciated.