Finding the Third Proportional to 21,018,636 and 31,678,299

Step by Step Solution

1. Step 1: Write the proportion equation
   21,018,636 : 31,678,299 = 31,678,299 : x
2. Step 2: Convert to fraction form
   21,018,636/31,678,299 = 31,678,299/x
3. Step 3: Cross multiply
   21,018,636x = 31,678,299 × 31,678,299
4. Step 4: Simplify right side
   21,018,636x = 1,003,514,627,533,401
5. Step 5: Solve for x
   x = 1,003,514,627,533,401/21,018,636
6. Step 6: Final answer
   x = 47,744,041.41