Finding the Fourth Proportional to 738.10, 1,018.72 and 439.42

Step by Step Solution

1. Step 1: Write the proportion equation
   738.10 : 1,018.72 = 439.42 : x
2. Step 2: Convert to fraction form
   738.10/1,018.72 = 439.42/x
3. Step 3: Cross multiply
   738.10x = 1,018.72 × 439.42
4. Step 4: Simplify right side
   738.10x = 447,645.94
5. Step 5: Solve for x
   x = 447,645.94/738.10
6. Step 6: Final answer
   x = 606.48