Finding the Fourth Proportional to 10,906.72, 16,360.80 and 3,979.36

Step by Step Solution

1. Step 1: Write the proportion equation
   10,906.72 : 16,360.80 = 3,979.36 : x
2. Step 2: Convert to fraction form
   10,906.72/16,360.80 = 3,979.36/x
3. Step 3: Cross multiply
   10,906.72x = 16,360.80 × 3,979.36
4. Step 4: Simplify right side
   10,906.72x = 65,105,513.09
5. Step 5: Solve for x
   x = 65,105,513.09/10,906.72
6. Step 6: Final answer
   x = 5,969.30