Finding the Fourth Proportional to 80.91, 111.67 and 51.82

Step by Step Solution

1. Step 1: Write the proportion equation
   80.91 : 111.67 = 51.82 : x
2. Step 2: Convert to fraction form
   80.91/111.67 = 51.82/x
3. Step 3: Cross multiply
   80.91x = 111.67 × 51.82
4. Step 4: Simplify right side
   80.91x = 5,786.33
5. Step 5: Solve for x
   x = 5,786.33/80.91
6. Step 6: Final answer
   x = 71.52