Finding the Third Proportional to 51,168.38 and 78,939.56

Step by Step Solution

1. Step 1: Write the proportion equation
   51,168.38 : 78,939.56 = 78,939.56 : x
2. Step 2: Convert to fraction form
   51,168.38/78,939.56 = 78,939.56/x
3. Step 3: Cross multiply
   51,168.38x = 78,939.56 × 78,939.56
4. Step 4: Simplify right side
   51,168.38x = 6,231,454,527.69
5. Step 5: Solve for x
   x = 6,231,454,527.69/51,168.38
6. Step 6: Final answer
   x = 121,783.32