Finding the Third Proportional to 12,485,645,412 and 18,039,601,395

Step by Step Solution

1. Step 1: Write the proportion equation
   12,485,645,412 : 18,039,601,395 = 18,039,601,395 : x
2. Step 2: Convert to fraction form
   12,485,645,412/18,039,601,395 = 18,039,601,395/x
3. Step 3: Cross multiply
   12,485,645,412x = 18,039,601,395 × 18,039,601,395
4. Step 4: Simplify right side
   12,485,645,412x = 325,427,218,490,485,964,800
5. Step 5: Solve for x
   x = 325,427,218,490,485,964,800/12,485,645,412
6. Step 6: Final answer
   x = 26,064,108,642.53