Finding the Fourth Proportional to 22,520.39, 31,080.98 and 13,087.13

Step by Step Solution

1. Step 1: Write the proportion equation
   22,520.39 : 31,080.98 = 13,087.13 : x
2. Step 2: Convert to fraction form
   22,520.39/31,080.98 = 13,087.13/x
3. Step 3: Cross multiply
   22,520.39x = 31,080.98 × 13,087.13
4. Step 4: Simplify right side
   22,520.39x = 406,760,703.10
5. Step 5: Solve for x
   x = 406,760,703.10/22,520.39
6. Step 6: Final answer
   x = 18,061.89