Finding the Third Proportional to 8,636,738 and 12,907,507

Step by Step Solution

1. Step 1: Write the proportion equation
   8,636,738 : 12,907,507 = 12,907,507 : x
2. Step 2: Convert to fraction form
   8,636,738/12,907,507 = 12,907,507/x
3. Step 3: Cross multiply
   8,636,738x = 12,907,507 × 12,907,507
4. Step 4: Simplify right side
   8,636,738x = 166,603,736,955,049
5. Step 5: Solve for x
   x = 166,603,736,955,049/8,636,738
6. Step 6: Final answer
   x = 19,290,122.84