Finding the Third Proportional to 10,840,988 and 21,407,800

Step by Step Solution

1. Step 1: Write the proportion equation
   10,840,988 : 21,407,800 = 21,407,800 : x
2. Step 2: Convert to fraction form
   10,840,988/21,407,800 = 21,407,800/x
3. Step 3: Cross multiply
   10,840,988x = 21,407,800 × 21,407,800
4. Step 4: Simplify right side
   10,840,988x = 458,293,900,840,000
5. Step 5: Solve for x
   x = 458,293,900,840,000/10,840,988
6. Step 6: Final answer
   x = 42,274,182.10