Finding the Fourth Proportional to 2,487.34, 3,432.27 and 1,439.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,487.34 : 3,432.27 = 1,439.20 : x
2. Step 2: Convert to fraction form
   2,487.34/3,432.27 = 1,439.20/x
3. Step 3: Cross multiply
   2,487.34x = 3,432.27 × 1,439.20
4. Step 4: Simplify right side
   2,487.34x = 4,939,722.98
5. Step 5: Solve for x
   x = 4,939,722.98/2,487.34
6. Step 6: Final answer
   x = 1,985.95