Finding the Fourth Proportional to 89.62, 123.60 and 86.12

Step by Step Solution

1. Step 1: Write the proportion equation
   89.62 : 123.60 = 86.12 : x
2. Step 2: Convert to fraction form
   89.62/123.60 = 86.12/x
3. Step 3: Cross multiply
   89.62x = 123.60 × 86.12
4. Step 4: Simplify right side
   89.62x = 10,644.43
5. Step 5: Solve for x
   x = 10,644.43/89.62
6. Step 6: Final answer
   x = 118.77