Finding the Third Proportional to 13,980 and 30,390

Step by Step Solution

1. Step 1: Write the proportion equation
   13,980 : 30,390 = 30,390 : x
2. Step 2: Convert to fraction form
   13,980/30,390 = 30,390/x
3. Step 3: Cross multiply
   13,980x = 30,390 × 30,390
4. Step 4: Simplify right side
   13,980x = 923,552,100
5. Step 5: Solve for x
   x = 923,552,100/13,980
6. Step 6: Final answer
   x = 66,062.38