A multi$-$unit process first combusts propane and then removes water from the exhaust stream. The process is designed to run at steady state. The company designing the process knows that they want to burn $70\%$ of the propane $($i$.$e$.$ yield of $C{O}_2$ is only $70\%$ of complete combustion of propane$).$ The simple combustion reaction for propane is given below. Please solve for the rate of stream D$.$

$C_3{H}_8+5O_{2}4H_{2}O+3C{O}_2$

Stream D