Finding the Fourth Proportional to 80.72, 120.96 and 67.98

Step by Step Solution

1. Step 1: Write the proportion equation
   80.72 : 120.96 = 67.98 : x
2. Step 2: Convert to fraction form
   80.72/120.96 = 67.98/x
3. Step 3: Cross multiply
   80.72x = 120.96 × 67.98
4. Step 4: Simplify right side
   80.72x = 8,222.86
5. Step 5: Solve for x
   x = 8,222.86/80.72
6. Step 6: Final answer
   x = 101.87