Finding the Fourth Proportional to 1,321.29, 1,982.01 and 443.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,321.29 : 1,982.01 = 443.72 : x
2. Step 2: Convert to fraction form
   1,321.29/1,982.01 = 443.72/x
3. Step 3: Cross multiply
   1,321.29x = 1,982.01 × 443.72
4. Step 4: Simplify right side
   1,321.29x = 879,458.52
5. Step 5: Solve for x
   x = 879,458.52/1,321.29
6. Step 6: Final answer
   x = 665.61