Finding the Fourth Proportional to 709.42, 978.72 and 443.73

Step by Step Solution

1. Step 1: Write the proportion equation
   709.42 : 978.72 = 443.73 : x
2. Step 2: Convert to fraction form
   709.42/978.72 = 443.73/x
3. Step 3: Cross multiply
   709.42x = 978.72 × 443.73
4. Step 4: Simplify right side
   709.42x = 434,289.79
5. Step 5: Solve for x
   x = 434,289.79/709.42
6. Step 6: Final answer
   x = 612.17