Finding the Fourth Proportional to 2,399.82, 3,311.71 and 1,405.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.82 : 3,311.71 = 1,405.61 : x
2. Step 2: Convert to fraction form
   2,399.82/3,311.71 = 1,405.61/x
3. Step 3: Cross multiply
   2,399.82x = 3,311.71 × 1,405.61
4. Step 4: Simplify right side
   2,399.82x = 4,654,972.69
5. Step 5: Solve for x
   x = 4,654,972.69/2,399.82
6. Step 6: Final answer
   x = 1,939.72