Finding the Third Proportional to 9,982,840 and 21,478,842

Step by Step Solution

1. Step 1: Write the proportion equation
   9,982,840 : 21,478,842 = 21,478,842 : x
2. Step 2: Convert to fraction form
   9,982,840/21,478,842 = 21,478,842/x
3. Step 3: Cross multiply
   9,982,840x = 21,478,842 × 21,478,842
4. Step 4: Simplify right side
   9,982,840x = 461,340,653,660,964
5. Step 5: Solve for x
   x = 461,340,653,660,964/9,982,840
6. Step 6: Final answer
   x = 46,213,367.50