Finding the Fourth Proportional to 57,215.96, 78,959.90 and 31,724.70

Step by Step Solution

1. Step 1: Write the proportion equation
   57,215.96 : 78,959.90 = 31,724.70 : x
2. Step 2: Convert to fraction form
   57,215.96/78,959.90 = 31,724.70/x
3. Step 3: Cross multiply
   57,215.96x = 78,959.90 × 31,724.70
4. Step 4: Simplify right side
   57,215.96x = 2,504,978,980.91
5. Step 5: Solve for x
   x = 2,504,978,980.91/57,215.96
6. Step 6: Final answer
   x = 43,781.13