Finding the Third Proportional to 3,984,308 and 8,447,428

Step by Step Solution

1. Step 1: Write the proportion equation
   3,984,308 : 8,447,428 = 8,447,428 : x
2. Step 2: Convert to fraction form
   3,984,308/8,447,428 = 8,447,428/x
3. Step 3: Cross multiply
   3,984,308x = 8,447,428 × 8,447,428
4. Step 4: Simplify right side
   3,984,308x = 71,359,039,815,184
5. Step 5: Solve for x
   x = 71,359,039,815,184/3,984,308
6. Step 6: Final answer
   x = 17,910,020.97