Finding the Third Proportional to 639,215,156,240 and 1,390,957,929,670

Step by Step Solution

1. Step 1: Write the proportion equation
   639,215,156,240 : 1,390,957,929,670 = 1,390,957,929,670 : x
2. Step 2: Convert to fraction form
   639,215,156,240/1,390,957,929,670 = 1,390,957,929,670/x
3. Step 3: Cross multiply
   639,215,156,240x = 1,390,957,929,670 × 1,390,957,929,670
4. Step 4: Simplify right side
   639,215,156,240x = 1,934,763,962,111,852,663,537,664
5. Step 5: Solve for x
   x = 1,934,763,962,111,852,663,537,664/639,215,156,240
6. Step 6: Final answer
   x = 3,026,780,487,328.47