Finding the Third Proportional to 78.79 and 122.45

Step by Step Solution

1. Step 1: Write the proportion equation
   78.79 : 122.45 = 122.45 : x
2. Step 2: Convert to fraction form
   78.79/122.45 = 122.45/x
3. Step 3: Cross multiply
   78.79x = 122.45 × 122.45
4. Step 4: Simplify right side
   78.79x = 14,993.81
5. Step 5: Solve for x
   x = 14,993.81/78.79
6. Step 6: Final answer
   x = 190.31