Finding the Fourth Proportional to 1,092.42, 1,638.90 and 443.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,092.42 : 1,638.90 = 443.34 : x
2. Step 2: Convert to fraction form
   1,092.42/1,638.90 = 443.34/x
3. Step 3: Cross multiply
   1,092.42x = 1,638.90 × 443.34
4. Step 4: Simplify right side
   1,092.42x = 726,589.93
5. Step 5: Solve for x
   x = 726,589.93/1,092.42
6. Step 6: Final answer
   x = 665.12