Finding the Fourth Proportional to 2,799.56, 4,198.12 and 851.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,799.56 : 4,198.12 = 851.31 : x
2. Step 2: Convert to fraction form
   2,799.56/4,198.12 = 851.31/x
3. Step 3: Cross multiply
   2,799.56x = 4,198.12 × 851.31
4. Step 4: Simplify right side
   2,799.56x = 3,573,880.55
5. Step 5: Solve for x
   x = 3,573,880.55/2,799.56
6. Step 6: Final answer
   x = 1,276.59