Finding the Fourth Proportional to 56,874.50, 78,491.24 and 31,385.90

Step by Step Solution

1. Step 1: Write the proportion equation
   56,874.50 : 78,491.24 = 31,385.90 : x
2. Step 2: Convert to fraction form
   56,874.50/78,491.24 = 31,385.90/x
3. Step 3: Cross multiply
   56,874.50x = 78,491.24 × 31,385.90
4. Step 4: Simplify right side
   56,874.50x = 2,463,518,209.52
5. Step 5: Solve for x
   x = 2,463,518,209.52/56,874.50
6. Step 6: Final answer
   x = 43,314.99