Finding the Third Proportional to 21,018,648 and 31,678,317

Step by Step Solution

1. Step 1: Write the proportion equation
   21,018,648 : 31,678,317 = 31,678,317 : x
2. Step 2: Convert to fraction form
   21,018,648/31,678,317 = 31,678,317/x
3. Step 3: Cross multiply
   21,018,648x = 31,678,317 × 31,678,317
4. Step 4: Simplify right side
   21,018,648x = 1,003,515,767,952,489
5. Step 5: Solve for x
   x = 1,003,515,767,952,489/21,018,648
6. Step 6: Final answer
   x = 47,744,068.41