Finding the Third Proportional to 9,986,308 and 21,515,268

Step by Step Solution

1. Step 1: Write the proportion equation
   9,986,308 : 21,515,268 = 21,515,268 : x
2. Step 2: Convert to fraction form
   9,986,308/21,515,268 = 21,515,268/x
3. Step 3: Cross multiply
   9,986,308x = 21,515,268 × 21,515,268
4. Step 4: Simplify right side
   9,986,308x = 462,906,757,111,824
5. Step 5: Solve for x
   x = 462,906,757,111,824/9,986,308
6. Step 6: Final answer
   x = 46,354,143.80