Finding the Fourth Proportional to 1,093.42, 1,638.69 and 443.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,093.42 : 1,638.69 = 443.80 : x
2. Step 2: Convert to fraction form
   1,093.42/1,638.69 = 443.80/x
3. Step 3: Cross multiply
   1,093.42x = 1,638.69 × 443.80
4. Step 4: Simplify right side
   1,093.42x = 727,250.62
5. Step 5: Solve for x
   x = 727,250.62/1,093.42
6. Step 6: Final answer
   x = 665.12