Finding the Third Proportional to 4,991,106 and 10,218,648

Step by Step Solution

1. Step 1: Write the proportion equation
   4,991,106 : 10,218,648 = 10,218,648 : x
2. Step 2: Convert to fraction form
   4,991,106/10,218,648 = 10,218,648/x
3. Step 3: Cross multiply
   4,991,106x = 10,218,648 × 10,218,648
4. Step 4: Simplify right side
   4,991,106x = 104,420,766,947,904
5. Step 5: Solve for x
   x = 104,420,766,947,904/4,991,106
6. Step 6: Final answer
   x = 20,921,368.32