Finding the Third Proportional to 3,920,040 and 8,440,654

Step by Step Solution

1. Step 1: Write the proportion equation
   3,920,040 : 8,440,654 = 8,440,654 : x
2. Step 2: Convert to fraction form
   3,920,040/8,440,654 = 8,440,654/x
3. Step 3: Cross multiply
   3,920,040x = 8,440,654 × 8,440,654
4. Step 4: Simplify right side
   3,920,040x = 71,244,639,947,716
5. Step 5: Solve for x
   x = 71,244,639,947,716/3,920,040
6. Step 6: Final answer
   x = 18,174,467.59