Finding the Third Proportional to 21,018,642 and 31,678,308

Step by Step Solution

1. Step 1: Write the proportion equation
   21,018,642 : 31,678,308 = 31,678,308 : x
2. Step 2: Convert to fraction form
   21,018,642/31,678,308 = 31,678,308/x
3. Step 3: Cross multiply
   21,018,642x = 31,678,308 × 31,678,308
4. Step 4: Simplify right side
   21,018,642x = 1,003,515,197,742,864
5. Step 5: Solve for x
   x = 1,003,515,197,742,864/21,018,642
6. Step 6: Final answer
   x = 47,744,054.91