Finding the Fourth Proportional to 57,078.24, 78,761.20 and 31,581.24

Step by Step Solution

1. Step 1: Write the proportion equation
   57,078.24 : 78,761.20 = 31,581.24 : x
2. Step 2: Convert to fraction form
   57,078.24/78,761.20 = 31,581.24/x
3. Step 3: Cross multiply
   57,078.24x = 78,761.20 × 31,581.24
4. Step 4: Simplify right side
   57,078.24x = 2,487,376,359.89
5. Step 5: Solve for x
   x = 2,487,376,359.89/57,078.24
6. Step 6: Final answer
   x = 43,578.36