Finding the Fourth Proportional to 2,399.88, 3,311.83 and 1,405.11

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.88 : 3,311.83 = 1,405.11 : x
2. Step 2: Convert to fraction form
   2,399.88/3,311.83 = 1,405.11/x
3. Step 3: Cross multiply
   2,399.88x = 3,311.83 × 1,405.11
4. Step 4: Simplify right side
   2,399.88x = 4,653,485.45
5. Step 5: Solve for x
   x = 4,653,485.45/2,399.88
6. Step 6: Final answer
   x = 1,939.05