Finding the Third Proportional to 67,928 and 137,688

Step by Step Solution

1. Step 1: Write the proportion equation
   67,928 : 137,688 = 137,688 : x
2. Step 2: Convert to fraction form
   67,928/137,688 = 137,688/x
3. Step 3: Cross multiply
   67,928x = 137,688 × 137,688
4. Step 4: Simplify right side
   67,928x = 18,957,985,344
5. Step 5: Solve for x
   x = 18,957,985,344/67,928
6. Step 6: Final answer
   x = 279,089.41