filtering with a dim table that is not directly related to the fact table

[leela77]

Hello.

I would like to COUNTROWS in the fact_ga_sessions table, however, I need filters from dim_ga_page, dim_ga_cart and dim_ga_session. 
It looks like I need FILTER, RELATEDTABLE, CALCULATETABLE(?), however, I am not quite sure how.
I would appreciated any help on this one. 

Note: A relationship could be created between dim_ga_page and fact_ga_session, however, it'll break other measures, that's already in there. I explicitly look for a DAX measure solution. 

[Rupak_bi]

Use countX function. it will work even without relationship as well. else share sample data.