Finding the Third Proportional to 172,628 and 264,978

Step by Step Solution

1. Step 1: Write the proportion equation
   172,628 : 264,978 = 264,978 : x
2. Step 2: Convert to fraction form
   172,628/264,978 = 264,978/x
3. Step 3: Cross multiply
   172,628x = 264,978 × 264,978
4. Step 4: Simplify right side
   172,628x = 70,213,340,484
5. Step 5: Solve for x
   x = 70,213,340,484/172,628
6. Step 6: Final answer
   x = 406,732.05