Finding the Third Proportional to 3,946,912 and 8,631,968

Step by Step Solution

1. Step 1: Write the proportion equation
   3,946,912 : 8,631,968 = 8,631,968 : x
2. Step 2: Convert to fraction form
   3,946,912/8,631,968 = 8,631,968/x
3. Step 3: Cross multiply
   3,946,912x = 8,631,968 × 8,631,968
4. Step 4: Simplify right side
   3,946,912x = 74,510,871,553,024
5. Step 5: Solve for x
   x = 74,510,871,553,024/3,946,912
6. Step 6: Final answer
   x = 18,878,270.29