Finding the Fourth Proportional to 7,079.72, 9,769.72 and 3,936.12

Step by Step Solution

1. Step 1: Write the proportion equation
   7,079.72 : 9,769.72 = 3,936.12 : x
2. Step 2: Convert to fraction form
   7,079.72/9,769.72 = 3,936.12/x
3. Step 3: Cross multiply
   7,079.72x = 9,769.72 × 3,936.12
4. Step 4: Simplify right side
   7,079.72x = 38,454,790.29
5. Step 5: Solve for x
   x = 38,454,790.29/7,079.72
6. Step 6: Final answer
   x = 5,431.68