Finding the Fourth Proportional to 2,488.59, 3,434.42 and 1,440.65

Step by Step Solution

1. Step 1: Write the proportion equation
   2,488.59 : 3,434.42 = 1,440.65 : x
2. Step 2: Convert to fraction form
   2,488.59/3,434.42 = 1,440.65/x
3. Step 3: Cross multiply
   2,488.59x = 3,434.42 × 1,440.65
4. Step 4: Simplify right side
   2,488.59x = 4,947,789.97
5. Step 5: Solve for x
   x = 4,947,789.97/2,488.59
6. Step 6: Final answer
   x = 1,988.19