Finding the Third Proportional to 8,638,215 and 19,997,997

Step by Step Solution

1. Step 1: Write the proportion equation
   8,638,215 : 19,997,997 = 19,997,997 : x
2. Step 2: Convert to fraction form
   8,638,215/19,997,997 = 19,997,997/x
3. Step 3: Cross multiply
   8,638,215x = 19,997,997 × 19,997,997
4. Step 4: Simplify right side
   8,638,215x = 399,919,884,012,009
5. Step 5: Solve for x
   x = 399,919,884,012,009/8,638,215
6. Step 6: Final answer
   x = 46,296,588.36