Finding the Fourth Proportional to 124.09, 186.18 and 89.89

Step by Step Solution

1. Step 1: Write the proportion equation
   124.09 : 186.18 = 89.89 : x
2. Step 2: Convert to fraction form
   124.09/186.18 = 89.89/x
3. Step 3: Cross multiply
   124.09x = 186.18 × 89.89
4. Step 4: Simplify right side
   124.09x = 16,735.72
5. Step 5: Solve for x
   x = 16,735.72/124.09
6. Step 6: Final answer
   x = 134.87