Finding the Fourth Proportional to 86.89, 118.85 and 86.62

Step by Step Solution

1. Step 1: Write the proportion equation
   86.89 : 118.85 = 86.62 : x
2. Step 2: Convert to fraction form
   86.89/118.85 = 86.62/x
3. Step 3: Cross multiply
   86.89x = 118.85 × 86.62
4. Step 4: Simplify right side
   86.89x = 10,293.76
5. Step 5: Solve for x
   x = 10,293.76/86.89
6. Step 6: Final answer
   x = 118.48