Finding the Third Proportional to 11,978,685 and 18,617,756

Step by Step Solution

1. Step 1: Write the proportion equation
   11,978,685 : 18,617,756 = 18,617,756 : x
2. Step 2: Convert to fraction form
   11,978,685/18,617,756 = 18,617,756/x
3. Step 3: Cross multiply
   11,978,685x = 18,617,756 × 18,617,756
4. Step 4: Simplify right side
   11,978,685x = 346,620,838,475,536
5. Step 5: Solve for x
   x = 346,620,838,475,536/11,978,685
6. Step 6: Final answer
   x = 28,936,468.27