Finding the Fourth Proportional to 80.82, 111.42 and 53.19

Step by Step Solution

1. Step 1: Write the proportion equation
   80.82 : 111.42 = 53.19 : x
2. Step 2: Convert to fraction form
   80.82/111.42 = 53.19/x
3. Step 3: Cross multiply
   80.82x = 111.42 × 53.19
4. Step 4: Simplify right side
   80.82x = 5,926.43
5. Step 5: Solve for x
   x = 5,926.43/80.82
6. Step 6: Final answer
   x = 73.33