Finding the Fourth Proportional to 2,412.56, 3,618.36 and 680.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,412.56 : 3,618.36 = 680.72 : x
2. Step 2: Convert to fraction form
   2,412.56/3,618.36 = 680.72/x
3. Step 3: Cross multiply
   2,412.56x = 3,618.36 × 680.72
4. Step 4: Simplify right side
   2,412.56x = 2,463,090.02
5. Step 5: Solve for x
   x = 2,463,090.02/2,412.56
6. Step 6: Final answer
   x = 1,020.94