Finding the Fourth Proportional to 2,555.85, 3,833.86 and 681.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,555.85 : 3,833.86 = 681.72 : x
2. Step 2: Convert to fraction form
   2,555.85/3,833.86 = 681.72/x
3. Step 3: Cross multiply
   2,555.85x = 3,833.86 × 681.72
4. Step 4: Simplify right side
   2,555.85x = 2,613,613.10
5. Step 5: Solve for x
   x = 2,613,613.10/2,555.85
6. Step 6: Final answer
   x = 1,022.60