Finding the Third Proportional to 8,721,915 and 12,997,788

Step by Step Solution

1. Step 1: Write the proportion equation
   8,721,915 : 12,997,788 = 12,997,788 : x
2. Step 2: Convert to fraction form
   8,721,915/12,997,788 = 12,997,788/x
3. Step 3: Cross multiply
   8,721,915x = 12,997,788 × 12,997,788
4. Step 4: Simplify right side
   8,721,915x = 168,942,492,892,944
5. Step 5: Solve for x
   x = 168,942,492,892,944/8,721,915
6. Step 6: Final answer
   x = 19,369,885.27