Finding the Third Proportional to 122,309.56 and 172,238.50

Step by Step Solution

1. Step 1: Write the proportion equation
   122,309.56 : 172,238.50 = 172,238.50 : x
2. Step 2: Convert to fraction form
   122,309.56/172,238.50 = 172,238.50/x
3. Step 3: Cross multiply
   122,309.56x = 172,238.50 × 172,238.50
4. Step 4: Simplify right side
   122,309.56x = 29,666,100,882.25
5. Step 5: Solve for x
   x = 29,666,100,882.25/122,309.56
6. Step 6: Final answer
   x = 242,549.32