Finding the Third Proportional to 12,485,645,406 and 18,039,601,386

Step by Step Solution

1. Step 1: Write the proportion equation
   12,485,645,406 : 18,039,601,386 = 18,039,601,386 : x
2. Step 2: Convert to fraction form
   12,485,645,406/18,039,601,386 = 18,039,601,386/x
3. Step 3: Cross multiply
   12,485,645,406x = 18,039,601,386 × 18,039,601,386
4. Step 4: Simplify right side
   12,485,645,406x = 325,427,218,165,773,107,200
5. Step 5: Solve for x
   x = 325,427,218,165,773,107,200/12,485,645,406
6. Step 6: Final answer
   x = 26,064,108,629.05