Finding the Third Proportional to 3,971,830 and 8,485,864

Step by Step Solution

1. Step 1: Write the proportion equation
   3,971,830 : 8,485,864 = 8,485,864 : x
2. Step 2: Convert to fraction form
   3,971,830/8,485,864 = 8,485,864/x
3. Step 3: Cross multiply
   3,971,830x = 8,485,864 × 8,485,864
4. Step 4: Simplify right side
   3,971,830x = 72,009,887,826,496
5. Step 5: Solve for x
   x = 72,009,887,826,496/3,971,830
6. Step 6: Final answer
   x = 18,130,153.56