Finding the Third Proportional to 254,842 and 404,864

Step by Step Solution

1. Step 1: Write the proportion equation
   254,842 : 404,864 = 404,864 : x
2. Step 2: Convert to fraction form
   254,842/404,864 = 404,864/x
3. Step 3: Cross multiply
   254,842x = 404,864 × 404,864
4. Step 4: Simplify right side
   254,842x = 163,914,858,496
5. Step 5: Solve for x
   x = 163,914,858,496/254,842
6. Step 6: Final answer
   x = 643,201.90