Finding the Fourth Proportional to 80.93, 111.61 and 63.42

Step by Step Solution

1. Step 1: Write the proportion equation
   80.93 : 111.61 = 63.42 : x
2. Step 2: Convert to fraction form
   80.93/111.61 = 63.42/x
3. Step 3: Cross multiply
   80.93x = 111.61 × 63.42
4. Step 4: Simplify right side
   80.93x = 7,078.15
5. Step 5: Solve for x
   x = 7,078.15/80.93
6. Step 6: Final answer
   x = 87.46