Finding the Fourth Proportional to 80.50, 111.06 and 49.42

Step by Step Solution

1. Step 1: Write the proportion equation
   80.50 : 111.06 = 49.42 : x
2. Step 2: Convert to fraction form
   80.50/111.06 = 49.42/x
3. Step 3: Cross multiply
   80.50x = 111.06 × 49.42
4. Step 4: Simplify right side
   80.50x = 5,488.59
5. Step 5: Solve for x
   x = 5,488.59/80.50
6. Step 6: Final answer
   x = 68.18