Finding the Fourth Proportional to 12,771.72, 17,640.72 and 9,229.32

Step by Step Solution

1. Step 1: Write the proportion equation
   12,771.72 : 17,640.72 = 9,229.32 : x
2. Step 2: Convert to fraction form
   12,771.72/17,640.72 = 9,229.32/x
3. Step 3: Cross multiply
   12,771.72x = 17,640.72 × 9,229.32
4. Step 4: Simplify right side
   12,771.72x = 162,811,849.91
5. Step 5: Solve for x
   x = 162,811,849.91/12,771.72
6. Step 6: Final answer
   x = 12,747.84