Finding the Fourth Proportional to 2,411.55, 3,617.45 and 680.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,411.55 : 3,617.45 = 680.31 : x
2. Step 2: Convert to fraction form
   2,411.55/3,617.45 = 680.31/x
3. Step 3: Cross multiply
   2,411.55x = 3,617.45 × 680.31
4. Step 4: Simplify right side
   2,411.55x = 2,460,987.41
5. Step 5: Solve for x
   x = 2,460,987.41/2,411.55
6. Step 6: Final answer
   x = 1,020.50