Finding the Fourth Proportional to 80.88, 111.61 and 51.82

Step by Step Solution

1. Step 1: Write the proportion equation
   80.88 : 111.61 = 51.82 : x
2. Step 2: Convert to fraction form
   80.88/111.61 = 51.82/x
3. Step 3: Cross multiply
   80.88x = 111.61 × 51.82
4. Step 4: Simplify right side
   80.88x = 5,783.63
5. Step 5: Solve for x
   x = 5,783.63/80.88
6. Step 6: Final answer
   x = 71.51