Finding the Third Proportional to 7,971,021 and 12,689,581.50

Step by Step Solution

1. Step 1: Write the proportion equation
   7,971,021 : 12,689,581.50 = 12,689,581.50 : x
2. Step 2: Convert to fraction form
   7,971,021/12,689,581.50 = 12,689,581.50/x
3. Step 3: Cross multiply
   7,971,021x = 12,689,581.50 × 12,689,581.50
4. Step 4: Simplify right side
   7,971,021x = 161,025,478,645,142.25
5. Step 5: Solve for x
   x = 161,025,478,645,142.25/7,971,021
6. Step 6: Final answer
   x = 20,201,361.74