Finding the Third Proportional to 8,636,742 and 12,907,512

Step by Step Solution

1. Step 1: Write the proportion equation
   8,636,742 : 12,907,512 = 12,907,512 : x
2. Step 2: Convert to fraction form
   8,636,742/12,907,512 = 12,907,512/x
3. Step 3: Cross multiply
   8,636,742x = 12,907,512 × 12,907,512
4. Step 4: Simplify right side
   8,636,742x = 166,603,866,030,144
5. Step 5: Solve for x
   x = 166,603,866,030,144/8,636,742
6. Step 6: Final answer
   x = 19,290,128.85