Finding the Fourth Proportional to 22,470.60, 31,010.03 and 12,399.18

Step by Step Solution

1. Step 1: Write the proportion equation
   22,470.60 : 31,010.03 = 12,399.18 : x
2. Step 2: Convert to fraction form
   22,470.60/31,010.03 = 12,399.18/x
3. Step 3: Cross multiply
   22,470.60x = 31,010.03 × 12,399.18
4. Step 4: Simplify right side
   22,470.60x = 384,498,943.78
5. Step 5: Solve for x
   x = 384,498,943.78/22,470.60
6. Step 6: Final answer
   x = 17,111.20