Finding the Third Proportional to 3,947,164 and 8,503,407

Step by Step Solution

1. Step 1: Write the proportion equation
   3,947,164 : 8,503,407 = 8,503,407 : x
2. Step 2: Convert to fraction form
   3,947,164/8,503,407 = 8,503,407/x
3. Step 3: Cross multiply
   3,947,164x = 8,503,407 × 8,503,407
4. Step 4: Simplify right side
   3,947,164x = 72,307,930,607,649
5. Step 5: Solve for x
   x = 72,307,930,607,649/3,947,164
6. Step 6: Final answer
   x = 18,318,957.77