Finding the Fourth Proportional to 2,818.27, 4,227.81 and 870.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,818.27 : 4,227.81 = 870.64 : x
2. Step 2: Convert to fraction form
   2,818.27/4,227.81 = 870.64/x
3. Step 3: Cross multiply
   2,818.27x = 4,227.81 × 870.64
4. Step 4: Simplify right side
   2,818.27x = 3,680,900.50
5. Step 5: Solve for x
   x = 3,680,900.50/2,818.27
6. Step 6: Final answer
   x = 1,306.09