Finding the Fourth Proportional to 16,762.72, 23,131.92 and 9,311.20

Step by Step Solution

1. Step 1: Write the proportion equation
   16,762.72 : 23,131.92 = 9,311.20 : x
2. Step 2: Convert to fraction form
   16,762.72/23,131.92 = 9,311.20/x
3. Step 3: Cross multiply
   16,762.72x = 23,131.92 × 9,311.20
4. Step 4: Simplify right side
   16,762.72x = 215,385,933.50
5. Step 5: Solve for x
   x = 215,385,933.50/16,762.72
6. Step 6: Final answer
   x = 12,849.10