Finding the Fourth Proportional to 16,128.61, 22,264.53 and 9,411.68

Step by Step Solution

1. Step 1: Write the proportion equation
   16,128.61 : 22,264.53 = 9,411.68 : x
2. Step 2: Convert to fraction form
   16,128.61/22,264.53 = 9,411.68/x
3. Step 3: Cross multiply
   16,128.61x = 22,264.53 × 9,411.68
4. Step 4: Simplify right side
   16,128.61x = 209,546,631.71
5. Step 5: Solve for x
   x = 209,546,631.71/16,128.61
6. Step 6: Final answer
   x = 12,992.24