Finding the Third Proportional to 8,690,128 and 13,147,039

Step by Step Solution

1. Step 1: Write the proportion equation
   8,690,128 : 13,147,039 = 13,147,039 : x
2. Step 2: Convert to fraction form
   8,690,128/13,147,039 = 13,147,039/x
3. Step 3: Cross multiply
   8,690,128x = 13,147,039 × 13,147,039
4. Step 4: Simplify right side
   8,690,128x = 172,844,634,467,521
5. Step 5: Solve for x
   x = 172,844,634,467,521/8,690,128
6. Step 6: Final answer
   x = 19,889,768.54