Finding the Third Proportional to 401,885 and 866,868.50

Step by Step Solution

1. Step 1: Write the proportion equation
   401,885 : 866,868.50 = 866,868.50 : x
2. Step 2: Convert to fraction form
   401,885/866,868.50 = 866,868.50/x
3. Step 3: Cross multiply
   401,885x = 866,868.50 × 866,868.50
4. Step 4: Simplify right side
   401,885x = 751,460,996,292.25
5. Step 5: Solve for x
   x = 751,460,996,292.25/401,885
6. Step 6: Final answer
   x = 1,869,840.87