Finding the Third Proportional to 3,965,410 and 8,686,430

Step by Step Solution

1. Step 1: Write the proportion equation
   3,965,410 : 8,686,430 = 8,686,430 : x
2. Step 2: Convert to fraction form
   3,965,410/8,686,430 = 8,686,430/x
3. Step 3: Cross multiply
   3,965,410x = 8,686,430 × 8,686,430
4. Step 4: Simplify right side
   3,965,410x = 75,454,066,144,900
5. Step 5: Solve for x
   x = 75,454,066,144,900/3,965,410
6. Step 6: Final answer
   x = 19,028,061.70