Finding the Third Proportional to 254,846 and 404,870

Step by Step Solution

1. Step 1: Write the proportion equation
   254,846 : 404,870 = 404,870 : x
2. Step 2: Convert to fraction form
   254,846/404,870 = 404,870/x
3. Step 3: Cross multiply
   254,846x = 404,870 × 404,870
4. Step 4: Simplify right side
   254,846x = 163,919,716,900
5. Step 5: Solve for x
   x = 163,919,716,900/254,846
6. Step 6: Final answer
   x = 643,210.87