Finding the Fourth Proportional to 22,561.31, 31,134.21 and 12,489.53

Step by Step Solution

1. Step 1: Write the proportion equation
   22,561.31 : 31,134.21 = 12,489.53 : x
2. Step 2: Convert to fraction form
   22,561.31/31,134.21 = 12,489.53/x
3. Step 3: Cross multiply
   22,561.31x = 31,134.21 × 12,489.53
4. Step 4: Simplify right side
   22,561.31x = 388,851,494.15
5. Step 5: Solve for x
   x = 388,851,494.15/22,561.31
6. Step 6: Final answer
   x = 17,235.33