Finding the Third Proportional to 20.75 and 42.13

Step by Step Solution

1. Step 1: Write the proportion equation
   20.75 : 42.13 = 42.13 : x
2. Step 2: Convert to fraction form
   20.75/42.13 = 42.13/x
3. Step 3: Cross multiply
   20.75x = 42.13 × 42.13
4. Step 4: Simplify right side
   20.75x = 1,774.52
5. Step 5: Solve for x
   x = 1,774.52/20.75
6. Step 6: Final answer
   x = 85.52