Finding the Third Proportional to 405,768 and 867,820

Step by Step Solution

1. Step 1: Write the proportion equation
   405,768 : 867,820 = 867,820 : x
2. Step 2: Convert to fraction form
   405,768/867,820 = 867,820/x
3. Step 3: Cross multiply
   405,768x = 867,820 × 867,820
4. Step 4: Simplify right side
   405,768x = 753,111,552,400
5. Step 5: Solve for x
   x = 753,111,552,400/405,768
6. Step 6: Final answer
   x = 1,856,015.14