Finding the Third Proportional to 9,691,799 and 21,144,009

Step by Step Solution

1. Step 1: Write the proportion equation
   9,691,799 : 21,144,009 = 21,144,009 : x
2. Step 2: Convert to fraction form
   9,691,799/21,144,009 = 21,144,009/x
3. Step 3: Cross multiply
   9,691,799x = 21,144,009 × 21,144,009
4. Step 4: Simplify right side
   9,691,799x = 447,069,116,592,081
5. Step 5: Solve for x
   x = 447,069,116,592,081/9,691,799
6. Step 6: Final answer
   x = 46,128,599.72