Finding the Fourth Proportional to 89.97, 134.78 and 53.82

Step by Step Solution

1. Step 1: Write the proportion equation
   89.97 : 134.78 = 53.82 : x
2. Step 2: Convert to fraction form
   89.97/134.78 = 53.82/x
3. Step 3: Cross multiply
   89.97x = 134.78 × 53.82
4. Step 4: Simplify right side
   89.97x = 7,253.59
5. Step 5: Solve for x
   x = 7,253.59/89.97
6. Step 6: Final answer
   x = 80.62