Finding the Third Proportional to 13,978 and 21,815

Step by Step Solution

1. Step 1: Write the proportion equation
   13,978 : 21,815 = 21,815 : x
2. Step 2: Convert to fraction form
   13,978/21,815 = 21,815/x
3. Step 3: Cross multiply
   13,978x = 21,815 × 21,815
4. Step 4: Simplify right side
   13,978x = 475,894,225
5. Step 5: Solve for x
   x = 475,894,225/13,978
6. Step 6: Final answer
   x = 34,045.95