Finding the Third Proportional to 254,908 and 404,860

Step by Step Solution

1. Step 1: Write the proportion equation
   254,908 : 404,860 = 404,860 : x
2. Step 2: Convert to fraction form
   254,908/404,860 = 404,860/x
3. Step 3: Cross multiply
   254,908x = 404,860 × 404,860
4. Step 4: Simplify right side
   254,908x = 163,911,619,600
5. Step 5: Solve for x
   x = 163,911,619,600/254,908
6. Step 6: Final answer
   x = 643,022.66