Finding the Fourth Proportional to 2,028.72, 3,042.22 and 857.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,028.72 : 3,042.22 = 857.96 : x
2. Step 2: Convert to fraction form
   2,028.72/3,042.22 = 857.96/x
3. Step 3: Cross multiply
   2,028.72x = 3,042.22 × 857.96
4. Step 4: Simplify right side
   2,028.72x = 2,610,103.07
5. Step 5: Solve for x
   x = 2,610,103.07/2,028.72
6. Step 6: Final answer
   x = 1,286.58