Finding the Third Proportional to 12,991,378 and 18,162,818

Step by Step Solution

1. Step 1: Write the proportion equation
   12,991,378 : 18,162,818 = 18,162,818 : x
2. Step 2: Convert to fraction form
   12,991,378/18,162,818 = 18,162,818/x
3. Step 3: Cross multiply
   12,991,378x = 18,162,818 × 18,162,818
4. Step 4: Simplify right side
   12,991,378x = 329,887,957,701,124
5. Step 5: Solve for x
   x = 329,887,957,701,124/12,991,378
6. Step 6: Final answer
   x = 25,392,838.06