Finding the Third Proportional to 80,868.38 and 172,109.81

Step by Step Solution

1. Step 1: Write the proportion equation
   80,868.38 : 172,109.81 = 172,109.81 : x
2. Step 2: Convert to fraction form
   80,868.38/172,109.81 = 172,109.81/x
3. Step 3: Cross multiply
   80,868.38x = 172,109.81 × 172,109.81
4. Step 4: Simplify right side
   80,868.38x = 29,621,787,558.79
5. Step 5: Solve for x
   x = 29,621,787,558.79/80,868.38
6. Step 6: Final answer
   x = 366,296.31