Finding the Third Proportional to 3,930,780 and 8,553,840

Step by Step Solution

1. Step 1: Write the proportion equation
   3,930,780 : 8,553,840 = 8,553,840 : x
2. Step 2: Convert to fraction form
   3,930,780/8,553,840 = 8,553,840/x
3. Step 3: Cross multiply
   3,930,780x = 8,553,840 × 8,553,840
4. Step 4: Simplify right side
   3,930,780x = 73,168,178,745,600
5. Step 5: Solve for x
   x = 73,168,178,745,600/3,930,780
6. Step 6: Final answer
   x = 18,614,162.77