Finding the Fourth Proportional to 1,321.52, 1,982.10 and 443.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,321.52 : 1,982.10 = 443.98 : x
2. Step 2: Convert to fraction form
   1,321.52/1,982.10 = 443.98/x
3. Step 3: Cross multiply
   1,321.52x = 1,982.10 × 443.98
4. Step 4: Simplify right side
   1,321.52x = 880,012.76
5. Step 5: Solve for x
   x = 880,012.76/1,321.52
6. Step 6: Final answer
   x = 665.91