Finding the Third Proportional to 13,636 and 17,990

Step by Step Solution

1. Step 1: Write the proportion equation
   13,636 : 17,990 = 17,990 : x
2. Step 2: Convert to fraction form
   13,636/17,990 = 17,990/x
3. Step 3: Cross multiply
   13,636x = 17,990 × 17,990
4. Step 4: Simplify right side
   13,636x = 323,640,100
5. Step 5: Solve for x
   x = 323,640,100/13,636
6. Step 6: Final answer
   x = 23,734.24