Finding the Third Proportional to 3,955,806 and 8,121,320

Step by Step Solution

1. Step 1: Write the proportion equation
   3,955,806 : 8,121,320 = 8,121,320 : x
2. Step 2: Convert to fraction form
   3,955,806/8,121,320 = 8,121,320/x
3. Step 3: Cross multiply
   3,955,806x = 8,121,320 × 8,121,320
4. Step 4: Simplify right side
   3,955,806x = 65,955,838,542,400
5. Step 5: Solve for x
   x = 65,955,838,542,400/3,955,806
6. Step 6: Final answer
   x = 16,673,173.19