Finding the Fourth Proportional to 57,218.72, 78,961.77 and 31,725

Step by Step Solution

1. Step 1: Write the proportion equation
   57,218.72 : 78,961.77 = 31,725 : x
2. Step 2: Convert to fraction form
   57,218.72/78,961.77 = 31,725/x
3. Step 3: Cross multiply
   57,218.72x = 78,961.77 × 31,725
4. Step 4: Simplify right side
   57,218.72x = 2,505,062,153.25
5. Step 5: Solve for x
   x = 2,505,062,153.25/57,218.72
6. Step 6: Final answer
   x = 43,780.47