Finding the Fourth Proportional to 80.79, 111.59 and 53.16

Step by Step Solution

1. Step 1: Write the proportion equation
   80.79 : 111.59 = 53.16 : x
2. Step 2: Convert to fraction form
   80.79/111.59 = 53.16/x
3. Step 3: Cross multiply
   80.79x = 111.59 × 53.16
4. Step 4: Simplify right side
   80.79x = 5,932.12
5. Step 5: Solve for x
   x = 5,932.12/80.79
6. Step 6: Final answer
   x = 73.43