Finding the Fourth Proportional to 80.94, 111.69 and 49.89

Step by Step Solution

1. Step 1: Write the proportion equation
   80.94 : 111.69 = 49.89 : x
2. Step 2: Convert to fraction form
   80.94/111.69 = 49.89/x
3. Step 3: Cross multiply
   80.94x = 111.69 × 49.89
4. Step 4: Simplify right side
   80.94x = 5,571.55
5. Step 5: Solve for x
   x = 5,571.55/80.94
6. Step 6: Final answer
   x = 68.83