Finding the Fourth Proportional to 2,399.64, 3,312.33 and 1,405.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.64 : 3,312.33 = 1,405.24 : x
2. Step 2: Convert to fraction form
   2,399.64/3,312.33 = 1,405.24/x
3. Step 3: Cross multiply
   2,399.64x = 3,312.33 × 1,405.24
4. Step 4: Simplify right side
   2,399.64x = 4,654,618.61
5. Step 5: Solve for x
   x = 4,654,618.61/2,399.64
6. Step 6: Final answer
   x = 1,939.72