Finding the Third Proportional to 3,940,706 and 8,489,316

Step by Step Solution

1. Step 1: Write the proportion equation
   3,940,706 : 8,489,316 = 8,489,316 : x
2. Step 2: Convert to fraction form
   3,940,706/8,489,316 = 8,489,316/x
3. Step 3: Cross multiply
   3,940,706x = 8,489,316 × 8,489,316
4. Step 4: Simplify right side
   3,940,706x = 72,068,486,147,856
5. Step 5: Solve for x
   x = 72,068,486,147,856/3,940,706
6. Step 6: Final answer
   x = 18,288,216.92