Finding the Fourth Proportional to 2,487.89, 3,433.59 and 1,439.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,487.89 : 3,433.59 = 1,439.96 : x
2. Step 2: Convert to fraction form
   2,487.89/3,433.59 = 1,439.96/x
3. Step 3: Cross multiply
   2,487.89x = 3,433.59 × 1,439.96
4. Step 4: Simplify right side
   2,487.89x = 4,944,215.09
5. Step 5: Solve for x
   x = 4,944,215.09/2,487.89
6. Step 6: Final answer
   x = 1,987.32