Finding the Fourth Proportional to 2,819.40, 4,227.69 and 871.35

Step by Step Solution

1. Step 1: Write the proportion equation
   2,819.40 : 4,227.69 = 871.35 : x
2. Step 2: Convert to fraction form
   2,819.40/4,227.69 = 871.35/x
3. Step 3: Cross multiply
   2,819.40x = 4,227.69 × 871.35
4. Step 4: Simplify right side
   2,819.40x = 3,683,797.68
5. Step 5: Solve for x
   x = 3,683,797.68/2,819.40
6. Step 6: Final answer
   x = 1,306.59