Finding the Fourth Proportional to 22,339.72, 30,825.12 and 12,909.16

Step by Step Solution

1. Step 1: Write the proportion equation
   22,339.72 : 30,825.12 = 12,909.16 : x
2. Step 2: Convert to fraction form
   22,339.72/30,825.12 = 12,909.16/x
3. Step 3: Cross multiply
   22,339.72x = 30,825.12 × 12,909.16
4. Step 4: Simplify right side
   22,339.72x = 397,926,406.10
5. Step 5: Solve for x
   x = 397,926,406.10/22,339.72
6. Step 6: Final answer
   x = 17,812.51