Finding the Third Proportional to 12,873,990 and 18,042,864

Step by Step Solution

1. Step 1: Write the proportion equation
   12,873,990 : 18,042,864 = 18,042,864 : x
2. Step 2: Convert to fraction form
   12,873,990/18,042,864 = 18,042,864/x
3. Step 3: Cross multiply
   12,873,990x = 18,042,864 × 18,042,864
4. Step 4: Simplify right side
   12,873,990x = 325,544,941,322,496
5. Step 5: Solve for x
   x = 325,544,941,322,496/12,873,990
6. Step 6: Final answer
   x = 25,287,027.67