Finding the Fourth Proportional to 16,287.72, 22,477.48 and 9,117.60

Step by Step Solution

1. Step 1: Write the proportion equation
   16,287.72 : 22,477.48 = 9,117.60 : x
2. Step 2: Convert to fraction form
   16,287.72/22,477.48 = 9,117.60/x
3. Step 3: Cross multiply
   16,287.72x = 22,477.48 × 9,117.60
4. Step 4: Simplify right side
   16,287.72x = 204,940,671.65
5. Step 5: Solve for x
   x = 204,940,671.65/16,287.72
6. Step 6: Final answer
   x = 12,582.53