Finding the Fourth Proportional to 2,412.79, 3,619.31 and 681.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,412.79 : 3,619.31 = 681.55 : x
2. Step 2: Convert to fraction form
   2,412.79/3,619.31 = 681.55/x
3. Step 3: Cross multiply
   2,412.79x = 3,619.31 × 681.55
4. Step 4: Simplify right side
   2,412.79x = 2,466,740.73
5. Step 5: Solve for x
   x = 2,466,740.73/2,412.79
6. Step 6: Final answer
   x = 1,022.36