Finding the Third Proportional to 20.16 and 42.53

Step by Step Solution

1. Step 1: Write the proportion equation
   20.16 : 42.53 = 42.53 : x
2. Step 2: Convert to fraction form
   20.16/42.53 = 42.53/x
3. Step 3: Cross multiply
   20.16x = 42.53 × 42.53
4. Step 4: Simplify right side
   20.16x = 1,808.91
5. Step 5: Solve for x
   x = 1,808.91/20.16
6. Step 6: Final answer
   x = 89.74