Finding the Fourth Proportional to 2,818.98, 4,229.28 and 871.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,818.98 : 4,229.28 = 871.56 : x
2. Step 2: Convert to fraction form
   2,818.98/4,229.28 = 871.56/x
3. Step 3: Cross multiply
   2,818.98x = 4,229.28 × 871.56
4. Step 4: Simplify right side
   2,818.98x = 3,686,071.28
5. Step 5: Solve for x
   x = 3,686,071.28/2,818.98
6. Step 6: Final answer
   x = 1,307.59