Finding the Third Proportional to 678,436 and 996,910

Step by Step Solution

1. Step 1: Write the proportion equation
   678,436 : 996,910 = 996,910 : x
2. Step 2: Convert to fraction form
   678,436/996,910 = 996,910/x
3. Step 3: Cross multiply
   678,436x = 996,910 × 996,910
4. Step 4: Simplify right side
   678,436x = 993,829,548,100
5. Step 5: Solve for x
   x = 993,829,548,100/678,436
6. Step 6: Final answer
   x = 1,464,883.27