Finding the Fourth Proportional to 2,078.10, 3,116.34 and 691.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078.10 : 3,116.34 = 691.06 : x
2. Step 2: Convert to fraction form
   2,078.10/3,116.34 = 691.06/x
3. Step 3: Cross multiply
   2,078.10x = 3,116.34 × 691.06
4. Step 4: Simplify right side
   2,078.10x = 2,153,577.92
5. Step 5: Solve for x
   x = 2,153,577.92/2,078.10
6. Step 6: Final answer
   x = 1,036.32