Finding the Fourth Proportional to 1,086.72, 1,626.42 and 674.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.72 : 1,626.42 = 674.42 : x
2. Step 2: Convert to fraction form
   1,086.72/1,626.42 = 674.42/x
3. Step 3: Cross multiply
   1,086.72x = 1,626.42 × 674.42
4. Step 4: Simplify right side
   1,086.72x = 1,096,890.18
5. Step 5: Solve for x
   x = 1,096,890.18/1,086.72
6. Step 6: Final answer
   x = 1,009.36