Finding the Fourth Proportional to 1,092.34, 1,638.71 and 443.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,092.34 : 1,638.71 = 443.53 : x
2. Step 2: Convert to fraction form
   1,092.34/1,638.71 = 443.53/x
3. Step 3: Cross multiply
   1,092.34x = 1,638.71 × 443.53
4. Step 4: Simplify right side
   1,092.34x = 726,817.05
5. Step 5: Solve for x
   x = 726,817.05/1,092.34
6. Step 6: Final answer
   x = 665.38