Finding the Fourth Proportional to 10,909.36, 16,359.18 and 3,979

Step by Step Solution

1. Step 1: Write the proportion equation
   10,909.36 : 16,359.18 = 3,979 : x
2. Step 2: Convert to fraction form
   10,909.36/16,359.18 = 3,979/x
3. Step 3: Cross multiply
   10,909.36x = 16,359.18 × 3,979
4. Step 4: Simplify right side
   10,909.36x = 65,093,177.22
5. Step 5: Solve for x
   x = 65,093,177.22/10,909.36
6. Step 6: Final answer
   x = 5,966.73