Finding the Third Proportional to 123,660 and 251,640

Step by Step Solution

1. Step 1: Write the proportion equation
   123,660 : 251,640 = 251,640 : x
2. Step 2: Convert to fraction form
   123,660/251,640 = 251,640/x
3. Step 3: Cross multiply
   123,660x = 251,640 × 251,640
4. Step 4: Simplify right side
   123,660x = 63,322,689,600
5. Step 5: Solve for x
   x = 63,322,689,600/123,660
6. Step 6: Final answer
   x = 512,070.92