Finding the Third Proportional to 3,947,718 and 8,609,367

Step by Step Solution

1. Step 1: Write the proportion equation
   3,947,718 : 8,609,367 = 8,609,367 : x
2. Step 2: Convert to fraction form
   3,947,718/8,609,367 = 8,609,367/x
3. Step 3: Cross multiply
   3,947,718x = 8,609,367 × 8,609,367
4. Step 4: Simplify right side
   3,947,718x = 74,121,200,140,689
5. Step 5: Solve for x
   x = 74,121,200,140,689/3,947,718
6. Step 6: Final answer
   x = 18,775,707.93