Finding the Third Proportional to 12,917 and 19,997

Step by Step Solution

1. Step 1: Write the proportion equation
   12,917 : 19,997 = 19,997 : x
2. Step 2: Convert to fraction form
   12,917/19,997 = 19,997/x
3. Step 3: Cross multiply
   12,917x = 19,997 × 19,997
4. Step 4: Simplify right side
   12,917x = 399,880,009
5. Step 5: Solve for x
   x = 399,880,009/12,917
6. Step 6: Final answer
   x = 30,957.65