Finding the Fourth Proportional to 2,597.57, 3,896.55 and 866.19

Step by Step Solution

1. Step 1: Write the proportion equation
   2,597.57 : 3,896.55 = 866.19 : x
2. Step 2: Convert to fraction form
   2,597.57/3,896.55 = 866.19/x
3. Step 3: Cross multiply
   2,597.57x = 3,896.55 × 866.19
4. Step 4: Simplify right side
   2,597.57x = 3,375,148.31
5. Step 5: Solve for x
   x = 3,375,148.31/2,597.57
6. Step 6: Final answer
   x = 1,299.35