Finding the Third Proportional to 318,665,532 and 685,758,688

Step by Step Solution

1. Step 1: Write the proportion equation
   318,665,532 : 685,758,688 = 685,758,688 : x
2. Step 2: Convert to fraction form
   318,665,532/685,758,688 = 685,758,688/x
3. Step 3: Cross multiply
   318,665,532x = 685,758,688 × 685,758,688
4. Step 4: Simplify right side
   318,665,532x = 470,264,978,167,481,344
5. Step 5: Solve for x
   x = 470,264,978,167,481,344/318,665,532
6. Step 6: Final answer
   x = 1,475,732,173.53