DAX - divide sum of each group by the total sum of all groups in Power BI

I have below table as shown in the screenshot. I have a measure called Together which sums the APP and POS value for each city.
Now i need to divide the sum value of each city under the Together column over the sum of all cities under same column.

so for the first city i should have 272/3800 = 0.0715
second city, 271/3800 = 0.0713
.
.
.
And so on.

How do i calculate this using DAX?

Screenshot

What i tried is Divide(Together, Sum(Together)) but it gives 1.

Step 1: Together measure

Together = SUMX('Cities',[App]+[Pos])

Step 2: AllCities measure

AllCities = CALCULATE([Together],ALL('Cities'[City]))

Step 3: Share measure

Share = DIVIDE([Together],[AllCities],BLANK())

Looks like you're coming from Excel, because the logic you outlined is normal Excel logic. If you think in terms of a database instead, then the logic may be easier. ALL() and REMOVEFILTERS() remove some or all parts of a filter context (In AllCities measure, I'm removing the [City] part of the filter context, so that I get the total for all cities. Then I Divide in Share. (Sure, I could do it in one measure, but I find it easier to understand if I do it a piece at a time).