Finding the Third Proportional to 89.75 and 121.88

Step by Step Solution

1. Step 1: Write the proportion equation
   89.75 : 121.88 = 121.88 : x
2. Step 2: Convert to fraction form
   89.75/121.88 = 121.88/x
3. Step 3: Cross multiply
   89.75x = 121.88 × 121.88
4. Step 4: Simplify right side
   89.75x = 14,853.52
5. Step 5: Solve for x
   x = 14,853.52/89.75
6. Step 6: Final answer
   x = 165.50