Finding the Fourth Proportional to 2,487.90, 3,432.72 and 1,439.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,487.90 : 3,432.72 = 1,439.37 : x
2. Step 2: Convert to fraction form
   2,487.90/3,432.72 = 1,439.37/x
3. Step 3: Cross multiply
   2,487.90x = 3,432.72 × 1,439.37
4. Step 4: Simplify right side
   2,487.90x = 4,940,954.19
5. Step 5: Solve for x
   x = 4,940,954.19/2,487.90
6. Step 6: Final answer
   x = 1,985.99