Finding the Fourth Proportional to 1,786.82, 2,680.37 and 691.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,786.82 : 2,680.37 = 691.10 : x
2. Step 2: Convert to fraction form
   1,786.82/2,680.37 = 691.10/x
3. Step 3: Cross multiply
   1,786.82x = 2,680.37 × 691.10
4. Step 4: Simplify right side
   1,786.82x = 1,852,386.85
5. Step 5: Solve for x
   x = 1,852,386.85/1,786.82
6. Step 6: Final answer
   x = 1,036.69