Finding the Third Proportional to 21.22 and 57.69

Step by Step Solution

1. Step 1: Write the proportion equation
   21.22 : 57.69 = 57.69 : x
2. Step 2: Convert to fraction form
   21.22/57.69 = 57.69/x
3. Step 3: Cross multiply
   21.22x = 57.69 × 57.69
4. Step 4: Simplify right side
   21.22x = 3,327.85
5. Step 5: Solve for x
   x = 3,327.85/21.22
6. Step 6: Final answer
   x = 156.84