Finding the Third Proportional to 10,138,630 and 21,115,970

Step by Step Solution

1. Step 1: Write the proportion equation
   10,138,630 : 21,115,970 = 21,115,970 : x
2. Step 2: Convert to fraction form
   10,138,630/21,115,970 = 21,115,970/x
3. Step 3: Cross multiply
   10,138,630x = 21,115,970 × 21,115,970
4. Step 4: Simplify right side
   10,138,630x = 445,884,189,040,900
5. Step 5: Solve for x
   x = 445,884,189,040,900/10,138,630
6. Step 6: Final answer
   x = 43,978,741.61