Finding the Fourth Proportional to 22,217.20, 30,660.06 and 12,659.20

Step by Step Solution

1. Step 1: Write the proportion equation
   22,217.20 : 30,660.06 = 12,659.20 : x
2. Step 2: Convert to fraction form
   22,217.20/30,660.06 = 12,659.20/x
3. Step 3: Cross multiply
   22,217.20x = 30,660.06 × 12,659.20
4. Step 4: Simplify right side
   22,217.20x = 388,131,831.55
5. Step 5: Solve for x
   x = 388,131,831.55/22,217.20
6. Step 6: Final answer
   x = 17,469.88