Finding the Fourth Proportional to 2,818.39, 4,227.48 and 870.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,818.39 : 4,227.48 = 870.59 : x
2. Step 2: Convert to fraction form
   2,818.39/4,227.48 = 870.59/x
3. Step 3: Cross multiply
   2,818.39x = 4,227.48 × 870.59
4. Step 4: Simplify right side
   2,818.39x = 3,680,401.81
5. Step 5: Solve for x
   x = 3,680,401.81/2,818.39
6. Step 6: Final answer
   x = 1,305.85