Finding the Fourth Proportional to 80.98, 111.78 and 53.38

Step by Step Solution

1. Step 1: Write the proportion equation
   80.98 : 111.78 = 53.38 : x
2. Step 2: Convert to fraction form
   80.98/111.78 = 53.38/x
3. Step 3: Cross multiply
   80.98x = 111.78 × 53.38
4. Step 4: Simplify right side
   80.98x = 5,966.82
5. Step 5: Solve for x
   x = 5,966.82/80.98
6. Step 6: Final answer
   x = 73.68