Finding the Third Proportional to 7,970,915 and 12,689,450

Step by Step Solution

1. Step 1: Write the proportion equation
   7,970,915 : 12,689,450 = 12,689,450 : x
2. Step 2: Convert to fraction form
   7,970,915/12,689,450 = 12,689,450/x
3. Step 3: Cross multiply
   7,970,915x = 12,689,450 × 12,689,450
4. Step 4: Simplify right side
   7,970,915x = 161,022,141,302,500
5. Step 5: Solve for x
   x = 161,022,141,302,500/7,970,915
6. Step 6: Final answer
   x = 20,201,211.69