Finding the Third Proportional to 12,803 and 19,871

Step by Step Solution

1. Step 1: Write the proportion equation
   12,803 : 19,871 = 19,871 : x
2. Step 2: Convert to fraction form
   12,803/19,871 = 19,871/x
3. Step 3: Cross multiply
   12,803x = 19,871 × 19,871
4. Step 4: Simplify right side
   12,803x = 394,856,641
5. Step 5: Solve for x
   x = 394,856,641/12,803
6. Step 6: Final answer
   x = 30,840.95