Finding the Fourth Proportional to 22,860.20, 31,549.98 and 12,789.20

Step by Step Solution

1. Step 1: Write the proportion equation
   22,860.20 : 31,549.98 = 12,789.20 : x
2. Step 2: Convert to fraction form
   22,860.20/31,549.98 = 12,789.20/x
3. Step 3: Cross multiply
   22,860.20x = 31,549.98 × 12,789.20
4. Step 4: Simplify right side
   22,860.20x = 403,499,004.22
5. Step 5: Solve for x
   x = 403,499,004.22/22,860.20
6. Step 6: Final answer
   x = 17,650.72