Finding the Fourth Proportional to 7,146.69, 9,861.90 and 3,959.67

Step by Step Solution

1. Step 1: Write the proportion equation
   7,146.69 : 9,861.90 = 3,959.67 : x
2. Step 2: Convert to fraction form
   7,146.69/9,861.90 = 3,959.67/x
3. Step 3: Cross multiply
   7,146.69x = 9,861.90 × 3,959.67
4. Step 4: Simplify right side
   7,146.69x = 39,049,869.57
5. Step 5: Solve for x
   x = 39,049,869.57/7,146.69
6. Step 6: Final answer
   x = 5,464.05