Finding the Fourth Proportional to 2,686.17, 4,028.79 and 711.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,686.17 : 4,028.79 = 711.82 : x
2. Step 2: Convert to fraction form
   2,686.17/4,028.79 = 711.82/x
3. Step 3: Cross multiply
   2,686.17x = 4,028.79 × 711.82
4. Step 4: Simplify right side
   2,686.17x = 2,867,773.30
5. Step 5: Solve for x
   x = 2,867,773.30/2,686.17
6. Step 6: Final answer
   x = 1,067.61