Finding the Third Proportional to 388,910 and 831,768

Step by Step Solution

1. Step 1: Write the proportion equation
   388,910 : 831,768 = 831,768 : x
2. Step 2: Convert to fraction form
   388,910/831,768 = 831,768/x
3. Step 3: Cross multiply
   388,910x = 831,768 × 831,768
4. Step 4: Simplify right side
   388,910x = 691,838,005,824
5. Step 5: Solve for x
   x = 691,838,005,824/388,910
6. Step 6: Final answer
   x = 1,778,915.45