Finding the Fourth Proportional to 22,470.60, 31,010.61 and 13,520.91

Step by Step Solution

1. Step 1: Write the proportion equation
   22,470.60 : 31,010.61 = 13,520.91 : x
2. Step 2: Convert to fraction form
   22,470.60/31,010.61 = 13,520.91/x
3. Step 3: Cross multiply
   22,470.60x = 31,010.61 × 13,520.91
4. Step 4: Simplify right side
   22,470.60x = 419,291,666.86
5. Step 5: Solve for x
   x = 419,291,666.86/22,470.60
6. Step 6: Final answer
   x = 18,659.57