Finding the Fourth Proportional to 2,487.98, 3,433.56 and 1,440.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,487.98 : 3,433.56 = 1,440.20 : x
2. Step 2: Convert to fraction form
   2,487.98/3,433.56 = 1,440.20/x
3. Step 3: Cross multiply
   2,487.98x = 3,433.56 × 1,440.20
4. Step 4: Simplify right side
   2,487.98x = 4,945,013.11
5. Step 5: Solve for x
   x = 4,945,013.11/2,487.98
6. Step 6: Final answer
   x = 1,987.56