Finding the Fourth Proportional to 56,644.92, 78,168.31 and 31,151.25

Step by Step Solution

1. Step 1: Write the proportion equation
   56,644.92 : 78,168.31 = 31,151.25 : x
2. Step 2: Convert to fraction form
   56,644.92/78,168.31 = 31,151.25/x
3. Step 3: Cross multiply
   56,644.92x = 78,168.31 × 31,151.25
4. Step 4: Simplify right side
   56,644.92x = 2,435,040,489.01
5. Step 5: Solve for x
   x = 2,435,040,489.01/56,644.92
6. Step 6: Final answer
   x = 42,987.80