Finding the Fourth Proportional to 22,557.50, 31,128.57 and 12,486.38

Step by Step Solution

1. Step 1: Write the proportion equation
   22,557.50 : 31,128.57 = 12,486.38 : x
2. Step 2: Convert to fraction form
   22,557.50/31,128.57 = 12,486.38/x
3. Step 3: Cross multiply
   22,557.50x = 31,128.57 × 12,486.38
4. Step 4: Simplify right side
   22,557.50x = 388,683,153.88
5. Step 5: Solve for x
   x = 388,683,153.88/22,557.50
6. Step 6: Final answer
   x = 17,230.77