Finding the Fourth Proportional to 2,488.89, 3,434.28 and 1,440.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,488.89 : 3,434.28 = 1,440.75 : x
2. Step 2: Convert to fraction form
   2,488.89/3,434.28 = 1,440.75/x
3. Step 3: Cross multiply
   2,488.89x = 3,434.28 × 1,440.75
4. Step 4: Simplify right side
   2,488.89x = 4,947,938.91
5. Step 5: Solve for x
   x = 4,947,938.91/2,488.89
6. Step 6: Final answer
   x = 1,988.01