Finding the Third Proportional to 4,483,280 and 9,728,640

Step by Step Solution

1. Step 1: Write the proportion equation
   4,483,280 : 9,728,640 = 9,728,640 : x
2. Step 2: Convert to fraction form
   4,483,280/9,728,640 = 9,728,640/x
3. Step 3: Cross multiply
   4,483,280x = 9,728,640 × 9,728,640
4. Step 4: Simplify right side
   4,483,280x = 94,646,436,249,600
5. Step 5: Solve for x
   x = 94,646,436,249,600/4,483,280
6. Step 6: Final answer
   x = 21,110,980.41