Finding the Third Proportional to 8,733,612,990 and 12,489,162,663

Step by Step Solution

1. Step 1: Write the proportion equation
   8,733,612,990 : 12,489,162,663 = 12,489,162,663 : x
2. Step 2: Convert to fraction form
   8,733,612,990/12,489,162,663 = 12,489,162,663/x
3. Step 3: Cross multiply
   8,733,612,990x = 12,489,162,663 × 12,489,162,663
4. Step 4: Simplify right side
   8,733,612,990x = 155,979,184,022,873,243,648
5. Step 5: Solve for x
   x = 155,979,184,022,873,243,648/8,733,612,990
6. Step 6: Final answer
   x = 17,859,640,013.99