Finding the Third Proportional to 388,919 and 831,786

Step by Step Solution

1. Step 1: Write the proportion equation
   388,919 : 831,786 = 831,786 : x
2. Step 2: Convert to fraction form
   388,919/831,786 = 831,786/x
3. Step 3: Cross multiply
   388,919x = 831,786 × 831,786
4. Step 4: Simplify right side
   388,919x = 691,867,949,796
5. Step 5: Solve for x
   x = 691,867,949,796/388,919
6. Step 6: Final answer
   x = 1,778,951.27