Finding the Third Proportional to 123,515 and 251,404

Step by Step Solution

1. Step 1: Write the proportion equation
   123,515 : 251,404 = 251,404 : x
2. Step 2: Convert to fraction form
   123,515/251,404 = 251,404/x
3. Step 3: Cross multiply
   123,515x = 251,404 × 251,404
4. Step 4: Simplify right side
   123,515x = 63,203,971,216
5. Step 5: Solve for x
   x = 63,203,971,216/123,515
6. Step 6: Final answer
   x = 511,710.90