Finding the Third Proportional to 123,510 and 251,391

Step by Step Solution

1. Step 1: Write the proportion equation
   123,510 : 251,391 = 251,391 : x
2. Step 2: Convert to fraction form
   123,510/251,391 = 251,391/x
3. Step 3: Cross multiply
   123,510x = 251,391 × 251,391
4. Step 4: Simplify right side
   123,510x = 63,197,434,881
5. Step 5: Solve for x
   x = 63,197,434,881/123,510
6. Step 6: Final answer
   x = 511,678.69