Finding the Fourth Proportional to 2,399.95, 3,311.92 and 1,405.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.95 : 3,311.92 = 1,405.42 : x
2. Step 2: Convert to fraction form
   2,399.95/3,311.92 = 1,405.42/x
3. Step 3: Cross multiply
   2,399.95x = 3,311.92 × 1,405.42
4. Step 4: Simplify right side
   2,399.95x = 4,654,615.02
5. Step 5: Solve for x
   x = 4,654,615.02/2,399.95
6. Step 6: Final answer
   x = 1,939.47