Finding the Third Proportional to 4,991,276 and 10,218,640

Step by Step Solution

1. Step 1: Write the proportion equation
   4,991,276 : 10,218,640 = 10,218,640 : x
2. Step 2: Convert to fraction form
   4,991,276/10,218,640 = 10,218,640/x
3. Step 3: Cross multiply
   4,991,276x = 10,218,640 × 10,218,640
4. Step 4: Simplify right side
   4,991,276x = 104,420,603,449,600
5. Step 5: Solve for x
   x = 104,420,603,449,600/4,991,276
6. Step 6: Final answer
   x = 20,920,622.99