Finding the Third Proportional to 318,671,404.50 and 685,770,363

Step by Step Solution

1. Step 1: Write the proportion equation
   318,671,404.50 : 685,770,363 = 685,770,363 : x
2. Step 2: Convert to fraction form
   318,671,404.50/685,770,363 = 685,770,363/x
3. Step 3: Cross multiply
   318,671,404.50x = 685,770,363 × 685,770,363
4. Step 4: Simplify right side
   318,671,404.50x = 470,280,990,769,151,744
5. Step 5: Solve for x
   x = 470,280,990,769,151,744/318,671,404.50
6. Step 6: Final answer
   x = 1,475,755,226.63