Finding the Fourth Proportional to 81,174.72, 121,732.92 and 31,229.31

Step by Step Solution

1. Step 1: Write the proportion equation
   81,174.72 : 121,732.92 = 31,229.31 : x
2. Step 2: Convert to fraction form
   81,174.72/121,732.92 = 31,229.31/x
3. Step 3: Cross multiply
   81,174.72x = 121,732.92 × 31,229.31
4. Step 4: Simplify right side
   81,174.72x = 3,801,635,095.89
5. Step 5: Solve for x
   x = 3,801,635,095.89/81,174.72
6. Step 6: Final answer
   x = 46,832.75