Finding the Fourth Proportional to 56,612.89, 78,124.92 and 31,118.71

Step by Step Solution

1. Step 1: Write the proportion equation
   56,612.89 : 78,124.92 = 31,118.71 : x
2. Step 2: Convert to fraction form
   56,612.89/78,124.92 = 31,118.71/x
3. Step 3: Cross multiply
   56,612.89x = 78,124.92 × 31,118.71
4. Step 4: Simplify right side
   56,612.89x = 2,431,146,729.25
5. Step 5: Solve for x
   x = 2,431,146,729.25/56,612.89
6. Step 6: Final answer
   x = 42,943.34