Finding the Third Proportional to 3,938,912 and 8,480,392

Step by Step Solution

1. Step 1: Write the proportion equation
   3,938,912 : 8,480,392 = 8,480,392 : x
2. Step 2: Convert to fraction form
   3,938,912/8,480,392 = 8,480,392/x
3. Step 3: Cross multiply
   3,938,912x = 8,480,392 × 8,480,392
4. Step 4: Simplify right side
   3,938,912x = 71,917,048,473,664
5. Step 5: Solve for x
   x = 71,917,048,473,664/3,938,912
6. Step 6: Final answer
   x = 18,258,099.82