Finding the Fourth Proportional to 443.50, 665.01 and 287.31

Step by Step Solution

1. Step 1: Write the proportion equation
   443.50 : 665.01 = 287.31 : x
2. Step 2: Convert to fraction form
   443.50/665.01 = 287.31/x
3. Step 3: Cross multiply
   443.50x = 665.01 × 287.31
4. Step 4: Simplify right side
   443.50x = 191,064.62
5. Step 5: Solve for x
   x = 191,064.62/443.50
6. Step 6: Final answer
   x = 430.81