Finding the Fourth Proportional to 89.75, 123.05 and 86.67

Step by Step Solution

1. Step 1: Write the proportion equation
   89.75 : 123.05 = 86.67 : x
2. Step 2: Convert to fraction form
   89.75/123.05 = 86.67/x
3. Step 3: Cross multiply
   89.75x = 123.05 × 86.67
4. Step 4: Simplify right side
   89.75x = 10,664.96
5. Step 5: Solve for x
   x = 10,664.96/89.75
6. Step 6: Final answer
   x = 118.83