Finding the Fourth Proportional to 16,280, 22,469.76 and 9,206.72

Step by Step Solution

1. Step 1: Write the proportion equation
   16,280 : 22,469.76 = 9,206.72 : x
2. Step 2: Convert to fraction form
   16,280/22,469.76 = 9,206.72/x
3. Step 3: Cross multiply
   16,280x = 22,469.76 × 9,206.72
4. Step 4: Simplify right side
   16,280x = 206,872,788.79
5. Step 5: Solve for x
   x = 206,872,788.79/16,280
6. Step 6: Final answer
   x = 12,707.17