Finding the Third Proportional to 12,821,996 and 19,917,281

Step by Step Solution

1. Step 1: Write the proportion equation
   12,821,996 : 19,917,281 = 19,917,281 : x
2. Step 2: Convert to fraction form
   12,821,996/19,917,281 = 19,917,281/x
3. Step 3: Cross multiply
   12,821,996x = 19,917,281 × 19,917,281
4. Step 4: Simplify right side
   12,821,996x = 396,698,082,432,961
5. Step 5: Solve for x
   x = 396,698,082,432,961/12,821,996
6. Step 6: Final answer
   x = 30,938,871.17