Finding the Third Proportional to 12,978 and 30,393

Step by Step Solution

1. Step 1: Write the proportion equation
   12,978 : 30,393 = 30,393 : x
2. Step 2: Convert to fraction form
   12,978/30,393 = 30,393/x
3. Step 3: Cross multiply
   12,978x = 30,393 × 30,393
4. Step 4: Simplify right side
   12,978x = 923,734,449
5. Step 5: Solve for x
   x = 923,734,449/12,978
6. Step 6: Final answer
   x = 71,176.95