Finding the Fourth Proportional to 9,628.31, 13,286.96 and 5,379.10

Step by Step Solution

1. Step 1: Write the proportion equation
   9,628.31 : 13,286.96 = 5,379.10 : x
2. Step 2: Convert to fraction form
   9,628.31/13,286.96 = 5,379.10/x
3. Step 3: Cross multiply
   9,628.31x = 13,286.96 × 5,379.10
4. Step 4: Simplify right side
   9,628.31x = 71,471,793.21
5. Step 5: Solve for x
   x = 71,471,793.21/9,628.31
6. Step 6: Final answer
   x = 7,423.09