Finding the Fourth Proportional to 2,818.42, 4,227.94 and 870.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,818.42 : 4,227.94 = 870.78 : x
2. Step 2: Convert to fraction form
   2,818.42/4,227.94 = 870.78/x
3. Step 3: Cross multiply
   2,818.42x = 4,227.94 × 870.78
4. Step 4: Simplify right side
   2,818.42x = 3,681,605.59
5. Step 5: Solve for x
   x = 3,681,605.59/2,818.42
6. Step 6: Final answer
   x = 1,306.27