Finding the Fourth Proportional to 2,488.06, 3,432.72 and 1,439.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,488.06 : 3,432.72 = 1,439.92 : x
2. Step 2: Convert to fraction form
   2,488.06/3,432.72 = 1,439.92/x
3. Step 3: Cross multiply
   2,488.06x = 3,432.72 × 1,439.92
4. Step 4: Simplify right side
   2,488.06x = 4,942,842.18
5. Step 5: Solve for x
   x = 4,942,842.18/2,488.06
6. Step 6: Final answer
   x = 1,986.62