Consider this multi-fluid container that contains fluids of different SGs as shown except for one fluid. Given that the pressure measured by the gage is 15.5 psia and the pressure in the container is 108.55 kPa, calculate the specific gravity of the missing fluid (SG4).
Given information: height of the container = 80 cm
sg1=1.3
sg2=1
sg3=0.9
sg4=?
Height of sg1=20 cm
Height of sg2=30 cm
Height of sg3=25 cm
Height of sg4=10 cm