Finding the Third Proportional to 63 and 72

Step by Step Solution

1. Step 1: Write the proportion equation
   63 : 72 = 72 : x
2. Step 2: Convert to fraction form
   63/72 = 72/x
3. Step 3: Cross multiply
   63x = 72 × 72
4. Step 4: Simplify right side
   63x = 5,184
5. Step 5: Solve for x
   x = 5,184/63
6. Step 6: Final answer
   x = 82.29