Finding the Third Proportional to 123,517.50 and 251,409

Step by Step Solution

1. Step 1: Write the proportion equation
   123,517.50 : 251,409 = 251,409 : x
2. Step 2: Convert to fraction form
   123,517.50/251,409 = 251,409/x
3. Step 3: Cross multiply
   123,517.50x = 251,409 × 251,409
4. Step 4: Simplify right side
   123,517.50x = 63,206,485,281
5. Step 5: Solve for x
   x = 63,206,485,281/123,517.50
6. Step 6: Final answer
   x = 511,720.89