Finding the Fourth Proportional to 21,108.96, 31,658.76 and 9,414.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,108.96 : 31,658.76 = 9,414.72 : x
2. Step 2: Convert to fraction form
   21,108.96/31,658.76 = 9,414.72/x
3. Step 3: Cross multiply
   21,108.96x = 31,658.76 × 9,414.72
4. Step 4: Simplify right side
   21,108.96x = 298,058,360.95
5. Step 5: Solve for x
   x = 298,058,360.95/21,108.96
6. Step 6: Final answer
   x = 14,119.99