Finding the Fourth Proportional to 89.27, 133.91 and 53.09

Step by Step Solution

1. Step 1: Write the proportion equation
   89.27 : 133.91 = 53.09 : x
2. Step 2: Convert to fraction form
   89.27/133.91 = 53.09/x
3. Step 3: Cross multiply
   89.27x = 133.91 × 53.09
4. Step 4: Simplify right side
   89.27x = 7,109.02
5. Step 5: Solve for x
   x = 7,109.02/89.27
6. Step 6: Final answer
   x = 79.64