Finding the Third Proportional to 3,969,628 and 8,611,398

Step by Step Solution

1. Step 1: Write the proportion equation
   3,969,628 : 8,611,398 = 8,611,398 : x
2. Step 2: Convert to fraction form
   3,969,628/8,611,398 = 8,611,398/x
3. Step 3: Cross multiply
   3,969,628x = 8,611,398 × 8,611,398
4. Step 4: Simplify right side
   3,969,628x = 74,156,175,514,404
5. Step 5: Solve for x
   x = 74,156,175,514,404/3,969,628
6. Step 6: Final answer
   x = 18,680,887.86