Finding the Third Proportional to 89.72 and 196.59

Step by Step Solution

1. Step 1: Write the proportion equation
   89.72 : 196.59 = 196.59 : x
2. Step 2: Convert to fraction form
   89.72/196.59 = 196.59/x
3. Step 3: Cross multiply
   89.72x = 196.59 × 196.59
4. Step 4: Simplify right side
   89.72x = 38,649.10
5. Step 5: Solve for x
   x = 38,649.10/89.72
6. Step 6: Final answer
   x = 430.78