Finding the Fourth Proportional to 3,993.90, 5,510.46 and 2,399.55

Step by Step Solution

1. Step 1: Write the proportion equation
   3,993.90 : 5,510.46 = 2,399.55 : x
2. Step 2: Convert to fraction form
   3,993.90/5,510.46 = 2,399.55/x
3. Step 3: Cross multiply
   3,993.90x = 5,510.46 × 2,399.55
4. Step 4: Simplify right side
   3,993.90x = 13,222,624.29
5. Step 5: Solve for x
   x = 13,222,624.29/3,993.90
6. Step 6: Final answer
   x = 3,310.70