Finding the Fourth Proportional to 1,092.72, 1,639.56 and 443.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,092.72 : 1,639.56 = 443.88 : x
2. Step 2: Convert to fraction form
   1,092.72/1,639.56 = 443.88/x
3. Step 3: Cross multiply
   1,092.72x = 1,639.56 × 443.88
4. Step 4: Simplify right side
   1,092.72x = 727,767.89
5. Step 5: Solve for x
   x = 727,767.89/1,092.72
6. Step 6: Final answer
   x = 666.01