Finding the Fourth Proportional to 16,128.13, 22,258.17 and 9,414.20

Step by Step Solution

1. Step 1: Write the proportion equation
   16,128.13 : 22,258.17 = 9,414.20 : x
2. Step 2: Convert to fraction form
   16,128.13/22,258.17 = 9,414.20/x
3. Step 3: Cross multiply
   16,128.13x = 22,258.17 × 9,414.20
4. Step 4: Simplify right side
   16,128.13x = 209,542,864.01
5. Step 5: Solve for x
   x = 209,542,864.01/16,128.13
6. Step 6: Final answer
   x = 12,992.38