Finding the Third Proportional to 254,863 and 404,895

Step by Step Solution

1. Step 1: Write the proportion equation
   254,863 : 404,895 = 404,895 : x
2. Step 2: Convert to fraction form
   254,863/404,895 = 404,895/x
3. Step 3: Cross multiply
   254,863x = 404,895 × 404,895
4. Step 4: Simplify right side
   254,863x = 163,939,961,025
5. Step 5: Solve for x
   x = 163,939,961,025/254,863
6. Step 6: Final answer
   x = 643,247.40