Finding the Fourth Proportional to 89.14, 123.74 and 86.63

Step by Step Solution

1. Step 1: Write the proportion equation
   89.14 : 123.74 = 86.63 : x
2. Step 2: Convert to fraction form
   89.14/123.74 = 86.63/x
3. Step 3: Cross multiply
   89.14x = 123.74 × 86.63
4. Step 4: Simplify right side
   89.14x = 10,719.60
5. Step 5: Solve for x
   x = 10,719.60/89.14
6. Step 6: Final answer
   x = 120.26