Finding the Third Proportional to 8,389,871 and 12,698,238

Step by Step Solution

1. Step 1: Write the proportion equation
   8,389,871 : 12,698,238 = 12,698,238 : x
2. Step 2: Convert to fraction form
   8,389,871/12,698,238 = 12,698,238/x
3. Step 3: Cross multiply
   8,389,871x = 12,698,238 × 12,698,238
4. Step 4: Simplify right side
   8,389,871x = 161,245,248,304,644
5. Step 5: Solve for x
   x = 161,245,248,304,644/8,389,871
6. Step 6: Final answer
   x = 19,219,037.85