Finding the Third Proportional to 400,905 and 864,012

Step by Step Solution

1. Step 1: Write the proportion equation
   400,905 : 864,012 = 864,012 : x
2. Step 2: Convert to fraction form
   400,905/864,012 = 864,012/x
3. Step 3: Cross multiply
   400,905x = 864,012 × 864,012
4. Step 4: Simplify right side
   400,905x = 746,516,736,144
5. Step 5: Solve for x
   x = 746,516,736,144/400,905
6. Step 6: Final answer
   x = 1,862,078.89