Finding the Fourth Proportional to 2,626.28, 3,939.89 and 871.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,626.28 : 3,939.89 = 871.39 : x
2. Step 2: Convert to fraction form
   2,626.28/3,939.89 = 871.39/x
3. Step 3: Cross multiply
   2,626.28x = 3,939.89 × 871.39
4. Step 4: Simplify right side
   2,626.28x = 3,433,185.48
5. Step 5: Solve for x
   x = 3,433,185.48/2,626.28
6. Step 6: Final answer
   x = 1,307.24