Finding the Fourth Proportional to 4,399.15, 6,591.83 and 2,639.83

Step by Step Solution

1. Step 1: Write the proportion equation
   4,399.15 : 6,591.83 = 2,639.83 : x
2. Step 2: Convert to fraction form
   4,399.15/6,591.83 = 2,639.83/x
3. Step 3: Cross multiply
   4,399.15x = 6,591.83 × 2,639.83
4. Step 4: Simplify right side
   4,399.15x = 17,401,310.59
5. Step 5: Solve for x
   x = 17,401,310.59/4,399.15
6. Step 6: Final answer
   x = 3,955.61