Finding the Third Proportional to 8,400,648 and 18,321,738

Step by Step Solution

1. Step 1: Write the proportion equation
   8,400,648 : 18,321,738 = 18,321,738 : x
2. Step 2: Convert to fraction form
   8,400,648/18,321,738 = 18,321,738/x
3. Step 3: Cross multiply
   8,400,648x = 18,321,738 × 18,321,738
4. Step 4: Simplify right side
   8,400,648x = 335,686,083,340,644
5. Step 5: Solve for x
   x = 335,686,083,340,644/8,400,648
6. Step 6: Final answer
   x = 39,959,546.38