Finding the Fourth Proportional to 1,321.38, 1,981.41 and 443.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,321.38 : 1,981.41 = 443.52 : x
2. Step 2: Convert to fraction form
   1,321.38/1,981.41 = 443.52/x
3. Step 3: Cross multiply
   1,321.38x = 1,981.41 × 443.52
4. Step 4: Simplify right side
   1,321.38x = 878,794.96
5. Step 5: Solve for x
   x = 878,794.96/1,321.38
6. Step 6: Final answer
   x = 665.06