Finding the Third Proportional to 20.84 and 42.84

Step by Step Solution

1. Step 1: Write the proportion equation
   20.84 : 42.84 = 42.84 : x
2. Step 2: Convert to fraction form
   20.84/42.84 = 42.84/x
3. Step 3: Cross multiply
   20.84x = 42.84 × 42.84
4. Step 4: Simplify right side
   20.84x = 1,835.59
5. Step 5: Solve for x
   x = 1,835.59/20.84
6. Step 6: Final answer
   x = 88.10