Finding the Fourth Proportional to 2,488.72, 3,435.60 and 1,440.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,488.72 : 3,435.60 = 1,440.58 : x
2. Step 2: Convert to fraction form
   2,488.72/3,435.60 = 1,440.58/x
3. Step 3: Cross multiply
   2,488.72x = 3,435.60 × 1,440.58
4. Step 4: Simplify right side
   2,488.72x = 4,949,256.65
5. Step 5: Solve for x
   x = 4,949,256.65/2,488.72
6. Step 6: Final answer
   x = 1,988.68