Finding the Third Proportional to 21.75 and 52.83

Step by Step Solution

1. Step 1: Write the proportion equation
   21.75 : 52.83 = 52.83 : x
2. Step 2: Convert to fraction form
   21.75/52.83 = 52.83/x
3. Step 3: Cross multiply
   21.75x = 52.83 × 52.83
4. Step 4: Simplify right side
   21.75x = 2,790.81
5. Step 5: Solve for x
   x = 2,790.81/21.75
6. Step 6: Final answer
   x = 128.31