Finding the Third Proportional to 3,969,664 and 8,611,468

Step by Step Solution

1. Step 1: Write the proportion equation
   3,969,664 : 8,611,468 = 8,611,468 : x
2. Step 2: Convert to fraction form
   3,969,664/8,611,468 = 8,611,468/x
3. Step 3: Cross multiply
   3,969,664x = 8,611,468 × 8,611,468
4. Step 4: Simplify right side
   3,969,664x = 74,157,381,115,024
5. Step 5: Solve for x
   x = 74,157,381,115,024/3,969,664
6. Step 6: Final answer
   x = 18,681,022.15