Finding the Third Proportional to 3,940,506 and 8,509,716

Step by Step Solution

1. Step 1: Write the proportion equation
   3,940,506 : 8,509,716 = 8,509,716 : x
2. Step 2: Convert to fraction form
   3,940,506/8,509,716 = 8,509,716/x
3. Step 3: Cross multiply
   3,940,506x = 8,509,716 × 8,509,716
4. Step 4: Simplify right side
   3,940,506x = 72,415,266,400,656
5. Step 5: Solve for x
   x = 72,415,266,400,656/3,940,506
6. Step 6: Final answer
   x = 18,377,149.13