Finding the Fourth Proportional to 2,078.35, 3,117.10 and 691.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078.35 : 3,117.10 = 691.27 : x
2. Step 2: Convert to fraction form
   2,078.35/3,117.10 = 691.27/x
3. Step 3: Cross multiply
   2,078.35x = 3,117.10 × 691.27
4. Step 4: Simplify right side
   2,078.35x = 2,154,757.72
5. Step 5: Solve for x
   x = 2,154,757.72/2,078.35
6. Step 6: Final answer
   x = 1,036.76