Finding the Third Proportional to 12,942 and 20,421

Step by Step Solution

1. Step 1: Write the proportion equation
   12,942 : 20,421 = 20,421 : x
2. Step 2: Convert to fraction form
   12,942/20,421 = 20,421/x
3. Step 3: Cross multiply
   12,942x = 20,421 × 20,421
4. Step 4: Simplify right side
   12,942x = 417,017,241
5. Step 5: Solve for x
   x = 417,017,241/12,942
6. Step 6: Final answer
   x = 32,222.01