Finding the Fourth Proportional to 56,781.52, 78,357.72 and 31,631.20

Step by Step Solution

1. Step 1: Write the proportion equation
   56,781.52 : 78,357.72 = 31,631.20 : x
2. Step 2: Convert to fraction form
   56,781.52/78,357.72 = 31,631.20/x
3. Step 3: Cross multiply
   56,781.52x = 78,357.72 × 31,631.20
4. Step 4: Simplify right side
   56,781.52x = 2,478,548,712.86
5. Step 5: Solve for x
   x = 2,478,548,712.86/56,781.52
6. Step 6: Final answer
   x = 43,650.62