Finding the Fourth Proportional to 16,128.69, 22,257.18 and 9,414.60

Step by Step Solution

1. Step 1: Write the proportion equation
   16,128.69 : 22,257.18 = 9,414.60 : x
2. Step 2: Convert to fraction form
   16,128.69/22,257.18 = 9,414.60/x
3. Step 3: Cross multiply
   16,128.69x = 22,257.18 × 9,414.60
4. Step 4: Simplify right side
   16,128.69x = 209,542,446.83
5. Step 5: Solve for x
   x = 209,542,446.83/16,128.69
6. Step 6: Final answer
   x = 12,991.91