Finding the Third Proportional to 3,998,312 and 8,706,544

Step by Step Solution

1. Step 1: Write the proportion equation
   3,998,312 : 8,706,544 = 8,706,544 : x
2. Step 2: Convert to fraction form
   3,998,312/8,706,544 = 8,706,544/x
3. Step 3: Cross multiply
   3,998,312x = 8,706,544 × 8,706,544
4. Step 4: Simplify right side
   3,998,312x = 75,803,908,423,936
5. Step 5: Solve for x
   x = 75,803,908,423,936/3,998,312
6. Step 6: Final answer
   x = 18,958,977.79