Finding the Fourth Proportional to 80.72, 111.34 and 67.05

Step by Step Solution

1. Step 1: Write the proportion equation
   80.72 : 111.34 = 67.05 : x
2. Step 2: Convert to fraction form
   80.72/111.34 = 67.05/x
3. Step 3: Cross multiply
   80.72x = 111.34 × 67.05
4. Step 4: Simplify right side
   80.72x = 7,465.35
5. Step 5: Solve for x
   x = 7,465.35/80.72
6. Step 6: Final answer
   x = 92.48