Finding the Fourth Proportional to 7,321.30, 10,103.40 and 3,964.09

Step by Step Solution

1. Step 1: Write the proportion equation
   7,321.30 : 10,103.40 = 3,964.09 : x
2. Step 2: Convert to fraction form
   7,321.30/10,103.40 = 3,964.09/x
3. Step 3: Cross multiply
   7,321.30x = 10,103.40 × 3,964.09
4. Step 4: Simplify right side
   7,321.30x = 40,050,786.91
5. Step 5: Solve for x
   x = 40,050,786.91/7,321.30
6. Step 6: Final answer
   x = 5,470.45