Finding the Fourth Proportional to 8,429.69, 12,651.83 and 3,239.21

Step by Step Solution

1. Step 1: Write the proportion equation
   8,429.69 : 12,651.83 = 3,239.21 : x
2. Step 2: Convert to fraction form
   8,429.69/12,651.83 = 3,239.21/x
3. Step 3: Cross multiply
   8,429.69x = 12,651.83 × 3,239.21
4. Step 4: Simplify right side
   8,429.69x = 40,981,934.25
5. Step 5: Solve for x
   x = 40,981,934.25/8,429.69
6. Step 6: Final answer
   x = 4,861.62