Finding the Third Proportional to 12,687,858 and 18,087,003

Step by Step Solution

1. Step 1: Write the proportion equation
   12,687,858 : 18,087,003 = 18,087,003 : x
2. Step 2: Convert to fraction form
   12,687,858/18,087,003 = 18,087,003/x
3. Step 3: Cross multiply
   12,687,858x = 18,087,003 × 18,087,003
4. Step 4: Simplify right side
   12,687,858x = 327,139,677,522,009
5. Step 5: Solve for x
   x = 327,139,677,522,009/12,687,858
6. Step 6: Final answer
   x = 25,783,680.55