Finding the Third Proportional to 6,391,469 and 8,638,099

Step by Step Solution

1. Step 1: Write the proportion equation
   6,391,469 : 8,638,099 = 8,638,099 : x
2. Step 2: Convert to fraction form
   6,391,469/8,638,099 = 8,638,099/x
3. Step 3: Cross multiply
   6,391,469x = 8,638,099 × 8,638,099
4. Step 4: Simplify right side
   6,391,469x = 74,616,754,333,801
5. Step 5: Solve for x
   x = 74,616,754,333,801/6,391,469
6. Step 6: Final answer
   x = 11,674,429.51