Finding the Fourth Proportional to 22,557.43, 31,129.31 and 12,486.57

Step by Step Solution

1. Step 1: Write the proportion equation
   22,557.43 : 31,129.31 = 12,486.57 : x
2. Step 2: Convert to fraction form
   22,557.43/31,129.31 = 12,486.57/x
3. Step 3: Cross multiply
   22,557.43x = 31,129.31 × 12,486.57
4. Step 4: Simplify right side
   22,557.43x = 388,698,308.37
5. Step 5: Solve for x
   x = 388,698,308.37/22,557.43
6. Step 6: Final answer
   x = 17,231.50