A steel tank with 2.5 m high vertical walls and a flat triangular floor is filled with three immiscible liquids layered upon each other. Two of the walls are 1.2 m long and perpendicular to each other. There is one tonne of water in the tank, a depth of 0.5 meters of one fluid with an RD of 0.84, and another fluid with a specific weight of 12.4 kN/m^3. Determine the total moment of the resultant hydrostatic thrust created by these fluids about the joint between the longest wall and floor.