Finding the Fourth Proportional to 89.14, 133.72 and 53.05

Step by Step Solution

1. Step 1: Write the proportion equation
   89.14 : 133.72 = 53.05 : x
2. Step 2: Convert to fraction form
   89.14/133.72 = 53.05/x
3. Step 3: Cross multiply
   89.14x = 133.72 × 53.05
4. Step 4: Simplify right side
   89.14x = 7,093.85
5. Step 5: Solve for x
   x = 7,093.85/89.14
6. Step 6: Final answer
   x = 79.58