Finding the Fourth Proportional to 80.91, 111.61 and 53.32

Step by Step Solution

1. Step 1: Write the proportion equation
   80.91 : 111.61 = 53.32 : x
2. Step 2: Convert to fraction form
   80.91/111.61 = 53.32/x
3. Step 3: Cross multiply
   80.91x = 111.61 × 53.32
4. Step 4: Simplify right side
   80.91x = 5,951.05
5. Step 5: Solve for x
   x = 5,951.05/80.91
6. Step 6: Final answer
   x = 73.55