Finding the Third Proportional to 13,938 and 30,978

Step by Step Solution

1. Step 1: Write the proportion equation
   13,938 : 30,978 = 30,978 : x
2. Step 2: Convert to fraction form
   13,938/30,978 = 30,978/x
3. Step 3: Cross multiply
   13,938x = 30,978 × 30,978
4. Step 4: Simplify right side
   13,938x = 959,636,484
5. Step 5: Solve for x
   x = 959,636,484/13,938
6. Step 6: Final answer
   x = 68,850.37