Finding the Fourth Proportional to 2,626.43, 3,939.17 and 871.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,626.43 : 3,939.17 = 871.47 : x
2. Step 2: Convert to fraction form
   2,626.43/3,939.17 = 871.47/x
3. Step 3: Cross multiply
   2,626.43x = 3,939.17 × 871.47
4. Step 4: Simplify right side
   2,626.43x = 3,432,864.12
5. Step 5: Solve for x
   x = 3,432,864.12/2,626.43
6. Step 6: Final answer
   x = 1,307.05