Finding the Fourth Proportional to 2,398.80, 3,311.10 and 1,404.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,398.80 : 3,311.10 = 1,404.57 : x
2. Step 2: Convert to fraction form
   2,398.80/3,311.10 = 1,404.57/x
3. Step 3: Cross multiply
   2,398.80x = 3,311.10 × 1,404.57
4. Step 4: Simplify right side
   2,398.80x = 4,650,671.73
5. Step 5: Solve for x
   x = 4,650,671.73/2,398.80
6. Step 6: Final answer
   x = 1,938.75