Finding the Third Proportional to 50.72 and 84.05

Step by Step Solution

1. Step 1: Write the proportion equation
   50.72 : 84.05 = 84.05 : x
2. Step 2: Convert to fraction form
   50.72/84.05 = 84.05/x
3. Step 3: Cross multiply
   50.72x = 84.05 × 84.05
4. Step 4: Simplify right side
   50.72x = 7,063.88
5. Step 5: Solve for x
   x = 7,063.88/50.72
6. Step 6: Final answer
   x = 139.28