Finding the Third Proportional to 4,129,947 and 8,857,764

Step by Step Solution

1. Step 1: Write the proportion equation
   4,129,947 : 8,857,764 = 8,857,764 : x
2. Step 2: Convert to fraction form
   4,129,947/8,857,764 = 8,857,764/x
3. Step 3: Cross multiply
   4,129,947x = 8,857,764 × 8,857,764
4. Step 4: Simplify right side
   4,129,947x = 78,459,983,079,696
5. Step 5: Solve for x
   x = 78,459,983,079,696/4,129,947
6. Step 6: Final answer
   x = 18,997,818.39