Finding the Fourth Proportional to 89.15, 133.16 and 79.49

Step by Step Solution

1. Step 1: Write the proportion equation
   89.15 : 133.16 = 79.49 : x
2. Step 2: Convert to fraction form
   89.15/133.16 = 79.49/x
3. Step 3: Cross multiply
   89.15x = 133.16 × 79.49
4. Step 4: Simplify right side
   89.15x = 10,584.82
5. Step 5: Solve for x
   x = 10,584.82/89.15
6. Step 6: Final answer
   x = 118.74