Finding the Fourth Proportional to 80.91, 111.59 and 49.83

Step by Step Solution

1. Step 1: Write the proportion equation
   80.91 : 111.59 = 49.83 : x
2. Step 2: Convert to fraction form
   80.91/111.59 = 49.83/x
3. Step 3: Cross multiply
   80.91x = 111.59 × 49.83
4. Step 4: Simplify right side
   80.91x = 5,560.28
5. Step 5: Solve for x
   x = 5,560.28/80.91
6. Step 6: Final answer
   x = 68.72