Finding the Fourth Proportional to 2,798.89, 4,198.56 and 851.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,798.89 : 4,198.56 = 851.09 : x
2. Step 2: Convert to fraction form
   2,798.89/4,198.56 = 851.09/x
3. Step 3: Cross multiply
   2,798.89x = 4,198.56 × 851.09
4. Step 4: Simplify right side
   2,798.89x = 3,573,352.43
5. Step 5: Solve for x
   x = 3,573,352.43/2,798.89
6. Step 6: Final answer
   x = 1,276.71