Finding the Fourth Proportional to 2,399.55, 3,311.31 and 1,455.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.55 : 3,311.31 = 1,455.87 : x
2. Step 2: Convert to fraction form
   2,399.55/3,311.31 = 1,455.87/x
3. Step 3: Cross multiply
   2,399.55x = 3,311.31 × 1,455.87
4. Step 4: Simplify right side
   2,399.55x = 4,820,836.89
5. Step 5: Solve for x
   x = 4,820,836.89/2,399.55
6. Step 6: Final answer
   x = 2,009.06