Finding the Fourth Proportional to 7,040.48, 9,715.76 and 3,896.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,040.48 : 9,715.76 = 3,896.72 : x
2. Step 2: Convert to fraction form
   7,040.48/9,715.76 = 3,896.72/x
3. Step 3: Cross multiply
   7,040.48x = 9,715.76 × 3,896.72
4. Step 4: Simplify right side
   7,040.48x = 37,859,596.31
5. Step 5: Solve for x
   x = 37,859,596.31/7,040.48
6. Step 6: Final answer
   x = 5,377.42