Finding the Fourth Proportional to 80.48, 120.72 and 28.42

Step by Step Solution

1. Step 1: Write the proportion equation
   80.48 : 120.72 = 28.42 : x
2. Step 2: Convert to fraction form
   80.48/120.72 = 28.42/x
3. Step 3: Cross multiply
   80.48x = 120.72 × 28.42
4. Step 4: Simplify right side
   80.48x = 3,430.86
5. Step 5: Solve for x
   x = 3,430.86/80.48
6. Step 6: Final answer
   x = 42.63