Finding the Third Proportional to 12,902 and 19,940

Step by Step Solution

1. Step 1: Write the proportion equation
   12,902 : 19,940 = 19,940 : x
2. Step 2: Convert to fraction form
   12,902/19,940 = 19,940/x
3. Step 3: Cross multiply
   12,902x = 19,940 × 19,940
4. Step 4: Simplify right side
   12,902x = 397,603,600
5. Step 5: Solve for x
   x = 397,603,600/12,902
6. Step 6: Final answer
   x = 30,817.21