Finding the Fourth Proportional to 10,908.36, 16,357.68 and 3,978

Step by Step Solution

1. Step 1: Write the proportion equation
   10,908.36 : 16,357.68 = 3,978 : x
2. Step 2: Convert to fraction form
   10,908.36/16,357.68 = 3,978/x
3. Step 3: Cross multiply
   10,908.36x = 16,357.68 × 3,978
4. Step 4: Simplify right side
   10,908.36x = 65,070,851.04
5. Step 5: Solve for x
   x = 65,070,851.04/10,908.36
6. Step 6: Final answer
   x = 5,965.23