Finding the Fourth Proportional to 22,470.88, 31,008.42 and 12,399.40

Step by Step Solution

1. Step 1: Write the proportion equation
   22,470.88 : 31,008.42 = 12,399.40 : x
2. Step 2: Convert to fraction form
   22,470.88/31,008.42 = 12,399.40/x
3. Step 3: Cross multiply
   22,470.88x = 31,008.42 × 12,399.40
4. Step 4: Simplify right side
   22,470.88x = 384,485,802.95
5. Step 5: Solve for x
   x = 384,485,802.95/22,470.88
6. Step 6: Final answer
   x = 17,110.40