Finding the Fourth Proportional to 1,153.27, 1,728.54 and 665.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,153.27 : 1,728.54 = 665.31 : x
2. Step 2: Convert to fraction form
   1,153.27/1,728.54 = 665.31/x
3. Step 3: Cross multiply
   1,153.27x = 1,728.54 × 665.31
4. Step 4: Simplify right side
   1,153.27x = 1,150,021.43
5. Step 5: Solve for x
   x = 1,150,021.43/1,153.27
6. Step 6: Final answer
   x = 997.18