Finding the Third Proportional to 42,390 and 67,108

Step by Step Solution

1. Step 1: Write the proportion equation
   42,390 : 67,108 = 67,108 : x
2. Step 2: Convert to fraction form
   42,390/67,108 = 67,108/x
3. Step 3: Cross multiply
   42,390x = 67,108 × 67,108
4. Step 4: Simplify right side
   42,390x = 4,503,483,664
5. Step 5: Solve for x
   x = 4,503,483,664/42,390
6. Step 6: Final answer
   x = 106,239.29