Finding the Fourth Proportional to 1,092.48, 1,639.34 and 443.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,092.48 : 1,639.34 = 443.27 : x
2. Step 2: Convert to fraction form
   1,092.48/1,639.34 = 443.27/x
3. Step 3: Cross multiply
   1,092.48x = 1,639.34 × 443.27
4. Step 4: Simplify right side
   1,092.48x = 726,659.83
5. Step 5: Solve for x
   x = 726,659.83/1,092.48
6. Step 6: Final answer
   x = 665.15