`(sqrt(4356)xxsqrt(?))/(sqrt(6084))=11`

(sqrt(2498)xxsqrt(625))/(sqrt(99))=?

sqrt(512)xxsqrt(1250)

sqrt(?)-11=sqrt(1764)

sqrt(26)xxsqrt(6.24)xxsqrt(102)=?

What approximate value will come in place of the question mark (?) in the following questions ? sqrt(6889)xxsqrt(4444)-:sqrt(260)=?

3sqrt(13824)xxsqrt(?)=864