Finding the Fourth Proportional to 56,298.50, 77,691.96 and 31,151.78

Step by Step Solution

1. Step 1: Write the proportion equation
   56,298.50 : 77,691.96 = 31,151.78 : x
2. Step 2: Convert to fraction form
   56,298.50/77,691.96 = 31,151.78/x
3. Step 3: Cross multiply
   56,298.50x = 77,691.96 × 31,151.78
4. Step 4: Simplify right side
   56,298.50x = 2,420,242,845.69
5. Step 5: Solve for x
   x = 2,420,242,845.69/56,298.50
6. Step 6: Final answer
   x = 42,989.47