Finding the Fourth Proportional to 56,629.80, 78,142.32 and 31,131.96

Step by Step Solution

1. Step 1: Write the proportion equation
   56,629.80 : 78,142.32 = 31,131.96 : x
2. Step 2: Convert to fraction form
   56,629.80/78,142.32 = 31,131.96/x
3. Step 3: Cross multiply
   56,629.80x = 78,142.32 × 31,131.96
4. Step 4: Simplify right side
   56,629.80x = 2,432,723,580.55
5. Step 5: Solve for x
   x = 2,432,723,580.55/56,629.80
6. Step 6: Final answer
   x = 42,958.36