Finding the Fourth Proportional to 80.72, 111.34 and 53.11

Step by Step Solution

1. Step 1: Write the proportion equation
   80.72 : 111.34 = 53.11 : x
2. Step 2: Convert to fraction form
   80.72/111.34 = 53.11/x
3. Step 3: Cross multiply
   80.72x = 111.34 × 53.11
4. Step 4: Simplify right side
   80.72x = 5,913.00
5. Step 5: Solve for x
   x = 5,913.00/80.72
6. Step 6: Final answer
   x = 73.25