Finding the Fourth Proportional to 14,081.28, 21,128.17 and 7,416.15

Step by Step Solution

1. Step 1: Write the proportion equation
   14,081.28 : 21,128.17 = 7,416.15 : x
2. Step 2: Convert to fraction form
   14,081.28/21,128.17 = 7,416.15/x
3. Step 3: Cross multiply
   14,081.28x = 21,128.17 × 7,416.15
4. Step 4: Simplify right side
   14,081.28x = 156,689,677.95
5. Step 5: Solve for x
   x = 156,689,677.95/14,081.28
6. Step 6: Final answer
   x = 11,127.52