Compare column values with measure

[Anonymous]

Hi guys,

This is how the data looks like. 

I have created a meaure which is nothing but the 75th percentile value by using the DAX shown below: 

Now I want to return only the staff id's which are above the 75th percentile value.

I have tried writing the DAX shown below but I am not able to compare it directly with the measure instead I have to hardcode the 75th percentile value. 

Could someone help me figure out how to achieve this without hardcode writing the 75th percentile value.
Thank you

[amitchandak]

@Anonymous , use like

sumx(values(Table[staff_id]),

if(sum(Table[Quantity sold]) >[Top 25th Percentile value] , sum(Table[Quantity sold]) )

[Anonymous]

This is what I get when I use the DAX suggested by you.

Whereas this is what I am expecting but without hardcoding the value for 75th percentile.