Finding the Third Proportional to 21.09 and 45.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21.09 : 45.42 = 45.42 : x
2. Step 2: Convert to fraction form
   21.09/45.42 = 45.42/x
3. Step 3: Cross multiply
   21.09x = 45.42 × 45.42
4. Step 4: Simplify right side
   21.09x = 2,063.15
5. Step 5: Solve for x
   x = 2,063.15/21.09
6. Step 6: Final answer
   x = 97.81