Finding the Third Proportional to 3,969,660 and 8,611,460

Step by Step Solution

1. Step 1: Write the proportion equation
   3,969,660 : 8,611,460 = 8,611,460 : x
2. Step 2: Convert to fraction form
   3,969,660/8,611,460 = 8,611,460/x
3. Step 3: Cross multiply
   3,969,660x = 8,611,460 × 8,611,460
4. Step 4: Simplify right side
   3,969,660x = 74,157,243,331,600
5. Step 5: Solve for x
   x = 74,157,243,331,600/3,969,660
6. Step 6: Final answer
   x = 18,681,006.27