Finding the Fourth Proportional to 22,561.12, 31,131.60 and 12,488.80

Step by Step Solution

1. Step 1: Write the proportion equation
   22,561.12 : 31,131.60 = 12,488.80 : x
2. Step 2: Convert to fraction form
   22,561.12/31,131.60 = 12,488.80/x
3. Step 3: Cross multiply
   22,561.12x = 31,131.60 × 12,488.80
4. Step 4: Simplify right side
   22,561.12x = 388,796,326.08
5. Step 5: Solve for x
   x = 388,796,326.08/22,561.12
6. Step 6: Final answer
   x = 17,233.02