Finding the Fourth Proportional to 89.01, 122.76 and 86.18

Step by Step Solution

1. Step 1: Write the proportion equation
   89.01 : 122.76 = 86.18 : x
2. Step 2: Convert to fraction form
   89.01/122.76 = 86.18/x
3. Step 3: Cross multiply
   89.01x = 122.76 × 86.18
4. Step 4: Simplify right side
   89.01x = 10,578.84
5. Step 5: Solve for x
   x = 10,578.84/89.01
6. Step 6: Final answer
   x = 118.85