Finding the Fourth Proportional to 2,028.72, 3,043.12 and 858.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,028.72 : 3,043.12 = 858.88 : x
2. Step 2: Convert to fraction form
   2,028.72/3,043.12 = 858.88/x
3. Step 3: Cross multiply
   2,028.72x = 3,043.12 × 858.88
4. Step 4: Simplify right side
   2,028.72x = 2,613,674.91
5. Step 5: Solve for x
   x = 2,613,674.91/2,028.72
6. Step 6: Final answer
   x = 1,288.34