Finding the Third Proportional to 12,990 and 17,622

Step by Step Solution

1. Step 1: Write the proportion equation
   12,990 : 17,622 = 17,622 : x
2. Step 2: Convert to fraction form
   12,990/17,622 = 17,622/x
3. Step 3: Cross multiply
   12,990x = 17,622 × 17,622
4. Step 4: Simplify right side
   12,990x = 310,534,884
5. Step 5: Solve for x
   x = 310,534,884/12,990
6. Step 6: Final answer
   x = 23,905.69