Finding the Fourth Proportional to 80.86, 111.61 and 53.23

Step by Step Solution

1. Step 1: Write the proportion equation
   80.86 : 111.61 = 53.23 : x
2. Step 2: Convert to fraction form
   80.86/111.61 = 53.23/x
3. Step 3: Cross multiply
   80.86x = 111.61 × 53.23
4. Step 4: Simplify right side
   80.86x = 5,940.44
5. Step 5: Solve for x
   x = 5,940.44/80.86
6. Step 6: Final answer
   x = 73.47