Finding the Third Proportional to 123,628 and 253,130

Step by Step Solution

1. Step 1: Write the proportion equation
   123,628 : 253,130 = 253,130 : x
2. Step 2: Convert to fraction form
   123,628/253,130 = 253,130/x
3. Step 3: Cross multiply
   123,628x = 253,130 × 253,130
4. Step 4: Simplify right side
   123,628x = 64,074,796,900
5. Step 5: Solve for x
   x = 64,074,796,900/123,628
6. Step 6: Final answer
   x = 518,287.09