Finding the Fourth Proportional to 2,073.69, 3,108.69 and 686.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,073.69 : 3,108.69 = 686.62 : x
2. Step 2: Convert to fraction form
   2,073.69/3,108.69 = 686.62/x
3. Step 3: Cross multiply
   2,073.69x = 3,108.69 × 686.62
4. Step 4: Simplify right side
   2,073.69x = 2,134,480.96
5. Step 5: Solve for x
   x = 2,134,480.96/2,073.69
6. Step 6: Final answer
   x = 1,029.32