Finding the Third Proportional to 80,149.50 and 172,089.56

Step by Step Solution

1. Step 1: Write the proportion equation
   80,149.50 : 172,089.56 = 172,089.56 : x
2. Step 2: Convert to fraction form
   80,149.50/172,089.56 = 172,089.56/x
3. Step 3: Cross multiply
   80,149.50x = 172,089.56 × 172,089.56
4. Step 4: Simplify right side
   80,149.50x = 29,614,817,521.44
5. Step 5: Solve for x
   x = 29,614,817,521.44/80,149.50
6. Step 6: Final answer
   x = 369,494.73