Finding the Third Proportional to 10,840,990 and 21,407,804

Step by Step Solution

1. Step 1: Write the proportion equation
   10,840,990 : 21,407,804 = 21,407,804 : x
2. Step 2: Convert to fraction form
   10,840,990/21,407,804 = 21,407,804/x
3. Step 3: Cross multiply
   10,840,990x = 21,407,804 × 21,407,804
4. Step 4: Simplify right side
   10,840,990x = 458,294,072,102,416
5. Step 5: Solve for x
   x = 458,294,072,102,416/10,840,990
6. Step 6: Final answer
   x = 42,274,190.10