Finding the Third Proportional to 8,721,918 and 12,997,792.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,721,918 : 12,997,792.50 = 12,997,792.50 : x
2. Step 2: Convert to fraction form
   8,721,918/12,997,792.50 = 12,997,792.50/x
3. Step 3: Cross multiply
   8,721,918x = 12,997,792.50 × 12,997,792.50
4. Step 4: Simplify right side
   8,721,918x = 168,942,609,873,056.25
5. Step 5: Solve for x
   x = 168,942,609,873,056.25/8,721,918
6. Step 6: Final answer
   x = 19,369,892.02