Finding the Fourth Proportional to 2,819.27, 4,229.31 and 871.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,819.27 : 4,229.31 = 871.64 : x
2. Step 2: Convert to fraction form
   2,819.27/4,229.31 = 871.64/x
3. Step 3: Cross multiply
   2,819.27x = 4,229.31 × 871.64
4. Step 4: Simplify right side
   2,819.27x = 3,686,435.77
5. Step 5: Solve for x
   x = 3,686,435.77/2,819.27
6. Step 6: Final answer
   x = 1,307.59