Finding the Third Proportional to 16,688 and 18,968

Step by Step Solution

1. Step 1: Write the proportion equation
   16,688 : 18,968 = 18,968 : x
2. Step 2: Convert to fraction form
   16,688/18,968 = 18,968/x
3. Step 3: Cross multiply
   16,688x = 18,968 × 18,968
4. Step 4: Simplify right side
   16,688x = 359,785,024
5. Step 5: Solve for x
   x = 359,785,024/16,688
6. Step 6: Final answer
   x = 21,559.51