Finding the Third Proportional to 401,886 and 866,870

Step by Step Solution

1. Step 1: Write the proportion equation
   401,886 : 866,870 = 866,870 : x
2. Step 2: Convert to fraction form
   401,886/866,870 = 866,870/x
3. Step 3: Cross multiply
   401,886x = 866,870 × 866,870
4. Step 4: Simplify right side
   401,886x = 751,463,596,900
5. Step 5: Solve for x
   x = 751,463,596,900/401,886
6. Step 6: Final answer
   x = 1,869,842.68