Finding the Fourth Proportional to 1,309.05, 1,963.89 and 443.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,309.05 : 1,963.89 = 443.37 : x
2. Step 2: Convert to fraction form
   1,309.05/1,963.89 = 443.37/x
3. Step 3: Cross multiply
   1,309.05x = 1,963.89 × 443.37
4. Step 4: Simplify right side
   1,309.05x = 870,729.91
5. Step 5: Solve for x
   x = 870,729.91/1,309.05
6. Step 6: Final answer
   x = 665.16