Finding the Fourth Proportional to 2,626.56, 3,939.48 and 871.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,626.56 : 3,939.48 = 871.12 : x
2. Step 2: Convert to fraction form
   2,626.56/3,939.48 = 871.12/x
3. Step 3: Cross multiply
   2,626.56x = 3,939.48 × 871.12
4. Step 4: Simplify right side
   2,626.56x = 3,431,759.82
5. Step 5: Solve for x
   x = 3,431,759.82/2,626.56
6. Step 6: Final answer
   x = 1,306.56