Finding the Third Proportional to 12,485,642,808 and 18,039,597,737.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,485,642,808 : 18,039,597,737.50 = 18,039,597,737.50 : x
2. Step 2: Convert to fraction form
   12,485,642,808/18,039,597,737.50 = 18,039,597,737.50/x
3. Step 3: Cross multiply
   12,485,642,808x = 18,039,597,737.50 × 18,039,597,737.50
4. Step 4: Simplify right side
   12,485,642,808x = 325,427,086,530,815,131,648
5. Step 5: Solve for x
   x = 325,427,086,530,815,131,648/12,485,642,808
6. Step 6: Final answer
   x = 26,064,103,509.54