Finding the Fourth Proportional to 2,311.55, 3,468.69 and 851.73

Step by Step Solution

1. Step 1: Write the proportion equation
   2,311.55 : 3,468.69 = 851.73 : x
2. Step 2: Convert to fraction form
   2,311.55/3,468.69 = 851.73/x
3. Step 3: Cross multiply
   2,311.55x = 3,468.69 × 851.73
4. Step 4: Simplify right side
   2,311.55x = 2,954,387.33
5. Step 5: Solve for x
   x = 2,954,387.33/2,311.55
6. Step 6: Final answer
   x = 1,278.10