Finding the Third Proportional to 3,947,172 and 8,503,404

Step by Step Solution

1. Step 1: Write the proportion equation
   3,947,172 : 8,503,404 = 8,503,404 : x
2. Step 2: Convert to fraction form
   3,947,172/8,503,404 = 8,503,404/x
3. Step 3: Cross multiply
   3,947,172x = 8,503,404 × 8,503,404
4. Step 4: Simplify right side
   3,947,172x = 72,307,879,587,216
5. Step 5: Solve for x
   x = 72,307,879,587,216/3,947,172
6. Step 6: Final answer
   x = 18,318,907.71