Finding the Fourth Proportional to 4,678.91, 6,456.89 and 2,689.85

Step by Step Solution

1. Step 1: Write the proportion equation
   4,678.91 : 6,456.89 = 2,689.85 : x
2. Step 2: Convert to fraction form
   4,678.91/6,456.89 = 2,689.85/x
3. Step 3: Cross multiply
   4,678.91x = 6,456.89 × 2,689.85
4. Step 4: Simplify right side
   4,678.91x = 17,368,019.83
5. Step 5: Solve for x
   x = 17,368,019.83/4,678.91
6. Step 6: Final answer
   x = 3,711.98