Finding the Fourth Proportional to 56,643.50, 78,168.71 and 31,152.63

Step by Step Solution

1. Step 1: Write the proportion equation
   56,643.50 : 78,168.71 = 31,152.63 : x
2. Step 2: Convert to fraction form
   56,643.50/78,168.71 = 31,152.63/x
3. Step 3: Cross multiply
   56,643.50x = 78,168.71 × 31,152.63
4. Step 4: Simplify right side
   56,643.50x = 2,435,161,271.22
5. Step 5: Solve for x
   x = 2,435,161,271.22/56,643.50
6. Step 6: Final answer
   x = 42,991.01