Finding the Third Proportional to 5,148 and 7,978

Step by Step Solution

1. Step 1: Write the proportion equation
   5,148 : 7,978 = 7,978 : x
2. Step 2: Convert to fraction form
   5,148/7,978 = 7,978/x
3. Step 3: Cross multiply
   5,148x = 7,978 × 7,978
4. Step 4: Simplify right side
   5,148x = 63,648,484
5. Step 5: Solve for x
   x = 63,648,484/5,148
6. Step 6: Final answer
   x = 12,363.73