Finding the Fourth Proportional to 7,039.89, 9,715.29 and 3,896.67

Step by Step Solution

1. Step 1: Write the proportion equation
   7,039.89 : 9,715.29 = 3,896.67 : x
2. Step 2: Convert to fraction form
   7,039.89/9,715.29 = 3,896.67/x
3. Step 3: Cross multiply
   7,039.89x = 9,715.29 × 3,896.67
4. Step 4: Simplify right side
   7,039.89x = 37,857,279.08
5. Step 5: Solve for x
   x = 37,857,279.08/7,039.89
6. Step 6: Final answer
   x = 5,377.54