Finding the Third Proportional to 10,906 and 13,390

Step by Step Solution

1. Step 1: Write the proportion equation
   10,906 : 13,390 = 13,390 : x
2. Step 2: Convert to fraction form
   10,906/13,390 = 13,390/x
3. Step 3: Cross multiply
   10,906x = 13,390 × 13,390
4. Step 4: Simplify right side
   10,906x = 179,292,100
5. Step 5: Solve for x
   x = 179,292,100/10,906
6. Step 6: Final answer
   x = 16,439.77