Finding the Third Proportional to 2,118,320 and 4,539,872

Step by Step Solution

1. Step 1: Write the proportion equation
   2,118,320 : 4,539,872 = 4,539,872 : x
2. Step 2: Convert to fraction form
   2,118,320/4,539,872 = 4,539,872/x
3. Step 3: Cross multiply
   2,118,320x = 4,539,872 × 4,539,872
4. Step 4: Simplify right side
   2,118,320x = 20,610,437,776,384
5. Step 5: Solve for x
   x = 20,610,437,776,384/2,118,320
6. Step 6: Final answer
   x = 9,729,614.87