Finding the Fourth Proportional to 1,086.96, 1,629.60 and 676

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.96 : 1,629.60 = 676 : x
2. Step 2: Convert to fraction form
   1,086.96/1,629.60 = 676/x
3. Step 3: Cross multiply
   1,086.96x = 1,629.60 × 676
4. Step 4: Simplify right side
   1,086.96x = 1,101,609.60
5. Step 5: Solve for x
   x = 1,101,609.60/1,086.96
6. Step 6: Final answer
   x = 1,013.48