Finding the Third Proportional to 3,992,570 and 8,657,756

Step by Step Solution

1. Step 1: Write the proportion equation
   3,992,570 : 8,657,756 = 8,657,756 : x
2. Step 2: Convert to fraction form
   3,992,570/8,657,756 = 8,657,756/x
3. Step 3: Cross multiply
   3,992,570x = 8,657,756 × 8,657,756
4. Step 4: Simplify right side
   3,992,570x = 74,956,738,955,536
5. Step 5: Solve for x
   x = 74,956,738,955,536/3,992,570
6. Step 6: Final answer
   x = 18,774,057.55