Finding the Third Proportional to 123,039 and 264,390

Step by Step Solution

1. Step 1: Write the proportion equation
   123,039 : 264,390 = 264,390 : x
2. Step 2: Convert to fraction form
   123,039/264,390 = 264,390/x
3. Step 3: Cross multiply
   123,039x = 264,390 × 264,390
4. Step 4: Simplify right side
   123,039x = 69,902,072,100
5. Step 5: Solve for x
   x = 69,902,072,100/123,039
6. Step 6: Final answer
   x = 568,129.39