Finding the Fourth Proportional to 8,321.69, 12,488.66 and 3,940.10

Step by Step Solution

1. Step 1: Write the proportion equation
   8,321.69 : 12,488.66 = 3,940.10 : x
2. Step 2: Convert to fraction form
   8,321.69/12,488.66 = 3,940.10/x
3. Step 3: Cross multiply
   8,321.69x = 12,488.66 × 3,940.10
4. Step 4: Simplify right side
   8,321.69x = 49,206,569.27
5. Step 5: Solve for x
   x = 49,206,569.27/8,321.69
6. Step 6: Final answer
   x = 5,913.05