Finding the Third Proportional to 10,138,628 and 21,115,966

Step by Step Solution

1. Step 1: Write the proportion equation
   10,138,628 : 21,115,966 = 21,115,966 : x
2. Step 2: Convert to fraction form
   10,138,628/21,115,966 = 21,115,966/x
3. Step 3: Cross multiply
   10,138,628x = 21,115,966 × 21,115,966
4. Step 4: Simplify right side
   10,138,628x = 445,884,020,113,156
5. Step 5: Solve for x
   x = 445,884,020,113,156/10,138,628
6. Step 6: Final answer
   x = 43,978,733.62