Finding the Third Proportional to 639,215,156,238 and 1,390,957,929,666

Step by Step Solution

1. Step 1: Write the proportion equation
   639,215,156,238 : 1,390,957,929,666 = 1,390,957,929,666 : x
2. Step 2: Convert to fraction form
   639,215,156,238/1,390,957,929,666 = 1,390,957,929,666/x
3. Step 3: Cross multiply
   639,215,156,238x = 1,390,957,929,666 × 1,390,957,929,666
4. Step 4: Simplify right side
   639,215,156,238x = 1,934,763,962,100,724,940,144,640
5. Step 5: Solve for x
   x = 1,934,763,962,100,724,940,144,640/639,215,156,238
6. Step 6: Final answer
   x = 3,026,780,487,320.53