Finding the Third Proportional to 3,867,288 and 8,507,856

Step by Step Solution

1. Step 1: Write the proportion equation
   3,867,288 : 8,507,856 = 8,507,856 : x
2. Step 2: Convert to fraction form
   3,867,288/8,507,856 = 8,507,856/x
3. Step 3: Cross multiply
   3,867,288x = 8,507,856 × 8,507,856
4. Step 4: Simplify right side
   3,867,288x = 72,383,613,716,736
5. Step 5: Solve for x
   x = 72,383,613,716,736/3,867,288
6. Step 6: Final answer
   x = 18,716,892.49