Finding the Third Proportional to 3,998,308 and 8,706,536

Step by Step Solution

1. Step 1: Write the proportion equation
   3,998,308 : 8,706,536 = 8,706,536 : x
2. Step 2: Convert to fraction form
   3,998,308/8,706,536 = 8,706,536/x
3. Step 3: Cross multiply
   3,998,308x = 8,706,536 × 8,706,536
4. Step 4: Simplify right side
   3,998,308x = 75,803,769,119,296
5. Step 5: Solve for x
   x = 75,803,769,119,296/3,998,308
6. Step 6: Final answer
   x = 18,958,961.92