Finding the Third Proportional to 15,861 and 27,978

Step by Step Solution

1. Step 1: Write the proportion equation
   15,861 : 27,978 = 27,978 : x
2. Step 2: Convert to fraction form
   15,861/27,978 = 27,978/x
3. Step 3: Cross multiply
   15,861x = 27,978 × 27,978
4. Step 4: Simplify right side
   15,861x = 782,768,484
5. Step 5: Solve for x
   x = 782,768,484/15,861
6. Step 6: Final answer
   x = 49,351.77