Countrows if for each month

Anonymous 

I didn't see table 3 in your sample file,so I created one.

please see if this is what you want

Table = 
var t1=SUMMARIZE(ADDCOLUMNS('Table 1',"_month",month('Table 1'[Month])),[_month],"countrowT1",COUNTROWS('Table 1'),"SUM CA T1",SUM('Table 1'[CA]))
var t2=SUMMARIZE(ADDCOLUMNS('Table 2',"_month",month('Table 2'[Month])),[_month],"countrowT2",COUNTROWS('Table 2'),"SUM CA T2",SUM('Table 2'[CA]))
VAR t3=SUMMARIZE(ADDCOLUMNS('Table 3',"_month",month('Table 3'[Month])),[_month],"countapple",CALCULATE(COUNTROWS('Table 3'),FILTER('Table 3','Table 3'[fruit]="apple")),"countbanana",CALCULATE(COUNTROWS('Table 3'),FILTER('Table 3','Table 3'[fruit]="banana")))
VAR t4=NATURALINNERJOIN(t1,t2)
return 
NATURALINNERJOIN(NATURALINNERJOIN(t1,t2),t3)

Hope this is helpful.