Finding the Third Proportional to 123,240 and 252,308

Step by Step Solution

1. Step 1: Write the proportion equation
   123,240 : 252,308 = 252,308 : x
2. Step 2: Convert to fraction form
   123,240/252,308 = 252,308/x
3. Step 3: Cross multiply
   123,240x = 252,308 × 252,308
4. Step 4: Simplify right side
   123,240x = 63,659,326,864
5. Step 5: Solve for x
   x = 63,659,326,864/123,240
6. Step 6: Final answer
   x = 516,547.61