Finding the Fourth Proportional to 22,557.80, 31,131.78 and 12,488.60

Step by Step Solution

1. Step 1: Write the proportion equation
   22,557.80 : 31,131.78 = 12,488.60 : x
2. Step 2: Convert to fraction form
   22,557.80/31,131.78 = 12,488.60/x
3. Step 3: Cross multiply
   22,557.80x = 31,131.78 × 12,488.60
4. Step 4: Simplify right side
   22,557.80x = 388,792,347.71
5. Step 5: Solve for x
   x = 388,792,347.71/22,557.80
6. Step 6: Final answer
   x = 17,235.38