Finding the Fourth Proportional to 2,398.65, 3,310.13 and 1,404.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,398.65 : 3,310.13 = 1,404.78 : x
2. Step 2: Convert to fraction form
   2,398.65/3,310.13 = 1,404.78/x
3. Step 3: Cross multiply
   2,398.65x = 3,310.13 × 1,404.78
4. Step 4: Simplify right side
   2,398.65x = 4,649,995.52
5. Step 5: Solve for x
   x = 4,649,995.52/2,398.65
6. Step 6: Final answer
   x = 1,938.59