Finding the Fourth Proportional to 22,559.40, 31,131.72 and 12,487.92

Step by Step Solution

1. Step 1: Write the proportion equation
   22,559.40 : 31,131.72 = 12,487.92 : x
2. Step 2: Convert to fraction form
   22,559.40/31,131.72 = 12,487.92/x
3. Step 3: Cross multiply
   22,559.40x = 31,131.72 × 12,487.92
4. Step 4: Simplify right side
   22,559.40x = 388,770,428.82
5. Step 5: Solve for x
   x = 388,770,428.82/22,559.40
6. Step 6: Final answer
   x = 17,233.19