Finding the Third Proportional to 12,865,396 and 19,902,678

Step by Step Solution

1. Step 1: Write the proportion equation
   12,865,396 : 19,902,678 = 19,902,678 : x
2. Step 2: Convert to fraction form
   12,865,396/19,902,678 = 19,902,678/x
3. Step 3: Cross multiply
   12,865,396x = 19,902,678 × 19,902,678
4. Step 4: Simplify right side
   12,865,396x = 396,116,591,571,684
5. Step 5: Solve for x
   x = 396,116,591,571,684/12,865,396
6. Step 6: Final answer
   x = 30,789,304.24