Finding the Fourth Proportional to 57,155.68, 78,874.83 and 31,315.15

Step by Step Solution

1. Step 1: Write the proportion equation
   57,155.68 : 78,874.83 = 31,315.15 : x
2. Step 2: Convert to fraction form
   57,155.68/78,874.83 = 31,315.15/x
3. Step 3: Cross multiply
   57,155.68x = 78,874.83 × 31,315.15
4. Step 4: Simplify right side
   57,155.68x = 2,469,977,132.67
5. Step 5: Solve for x
   x = 2,469,977,132.67/57,155.68
6. Step 6: Final answer
   x = 43,214.90