Finding the Fourth Proportional to 10,668.21, 14,689.85 and 8,422.89

Step by Step Solution

1. Step 1: Write the proportion equation
   10,668.21 : 14,689.85 = 8,422.89 : x
2. Step 2: Convert to fraction form
   10,668.21/14,689.85 = 8,422.89/x
3. Step 3: Cross multiply
   10,668.21x = 14,689.85 × 8,422.89
4. Step 4: Simplify right side
   10,668.21x = 123,730,990.67
5. Step 5: Solve for x
   x = 123,730,990.67/10,668.21
6. Step 6: Final answer
   x = 11,598.10