Finding the Third Proportional to 8,311,585,792.50 and 12,880,669,540.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,311,585,792.50 : 12,880,669,540.50 = 12,880,669,540.50 : x
2. Step 2: Convert to fraction form
   8,311,585,792.50/12,880,669,540.50 = 12,880,669,540.50/x
3. Step 3: Cross multiply
   8,311,585,792.50x = 12,880,669,540.50 × 12,880,669,540.50
4. Step 4: Simplify right side
   8,311,585,792.50x = 165,911,647,811,564,470,272
5. Step 5: Solve for x
   x = 165,911,647,811,564,470,272/8,311,585,792.50
6. Step 6: Final answer
   x = 19,961,491,339.15