Finding the Fourth Proportional to 21,144.98, 31,701.07 and 8,668.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,144.98 : 31,701.07 = 8,668.15 : x
2. Step 2: Convert to fraction form
   21,144.98/31,701.07 = 8,668.15/x
3. Step 3: Cross multiply
   21,144.98x = 31,701.07 × 8,668.15
4. Step 4: Simplify right side
   21,144.98x = 274,789,561.50
5. Step 5: Solve for x
   x = 274,789,561.50/21,144.98
6. Step 6: Final answer
   x = 12,995.50