Finding the Third Proportional to 80,369.72 and 172,836.56

Step by Step Solution

1. Step 1: Write the proportion equation
   80,369.72 : 172,836.56 = 172,836.56 : x
2. Step 2: Convert to fraction form
   80,369.72/172,836.56 = 172,836.56/x
3. Step 3: Cross multiply
   80,369.72x = 172,836.56 × 172,836.56
4. Step 4: Simplify right side
   80,369.72x = 29,872,477,336.82
5. Step 5: Solve for x
   x = 29,872,477,336.82/80,369.72
6. Step 6: Final answer
   x = 371,688.22