Finding the Fourth Proportional to 56,615.87, 78,130.87 and 31,123.31

Step by Step Solution

1. Step 1: Write the proportion equation
   56,615.87 : 78,130.87 = 31,123.31 : x
2. Step 2: Convert to fraction form
   56,615.87/78,130.87 = 31,123.31/x
3. Step 3: Cross multiply
   56,615.87x = 78,130.87 × 31,123.31
4. Step 4: Simplify right side
   56,615.87x = 2,431,691,287.58
5. Step 5: Solve for x
   x = 2,431,691,287.58/56,615.87
6. Step 6: Final answer
   x = 42,950.70