Finding the Fourth Proportional to 8,105.31, 12,149.55 and 4,399.65

Step by Step Solution

1. Step 1: Write the proportion equation
   8,105.31 : 12,149.55 = 4,399.65 : x
2. Step 2: Convert to fraction form
   8,105.31/12,149.55 = 4,399.65/x
3. Step 3: Cross multiply
   8,105.31x = 12,149.55 × 4,399.65
4. Step 4: Simplify right side
   8,105.31x = 53,453,767.66
5. Step 5: Solve for x
   x = 53,453,767.66/8,105.31
6. Step 6: Final answer
   x = 6,594.91