Finding the Third Proportional to 307,931,986 and 637,691,196

Step by Step Solution

1. Step 1: Write the proportion equation
   307,931,986 : 637,691,196 = 637,691,196 : x
2. Step 2: Convert to fraction form
   307,931,986/637,691,196 = 637,691,196/x
3. Step 3: Cross multiply
   307,931,986x = 637,691,196 × 637,691,196
4. Step 4: Simplify right side
   307,931,986x = 406,650,061,455,910,400
5. Step 5: Solve for x
   x = 406,650,061,455,910,400/307,931,986
6. Step 6: Final answer
   x = 1,320,584,024.86