Finding the Fourth Proportional to 2,399.73, 3,311.70 and 1,405.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.73 : 3,311.70 = 1,405.05 : x
2. Step 2: Convert to fraction form
   2,399.73/3,311.70 = 1,405.05/x
3. Step 3: Cross multiply
   2,399.73x = 3,311.70 × 1,405.05
4. Step 4: Simplify right side
   2,399.73x = 4,653,104.09
5. Step 5: Solve for x
   x = 4,653,104.09/2,399.73
6. Step 6: Final answer
   x = 1,939.01