Finding the Third Proportional to 50.72 and 78.36

Step by Step Solution

1. Step 1: Write the proportion equation
   50.72 : 78.36 = 78.36 : x
2. Step 2: Convert to fraction form
   50.72/78.36 = 78.36/x
3. Step 3: Cross multiply
   50.72x = 78.36 × 78.36
4. Step 4: Simplify right side
   50.72x = 6,139.51
5. Step 5: Solve for x
   x = 6,139.51/50.72
6. Step 6: Final answer
   x = 121.04