Finding the Fourth Proportional to 9,628.81, 13,286.42 and 5,379.34

Step by Step Solution

1. Step 1: Write the proportion equation
   9,628.81 : 13,286.42 = 5,379.34 : x
2. Step 2: Convert to fraction form
   9,628.81/13,286.42 = 5,379.34/x
3. Step 3: Cross multiply
   9,628.81x = 13,286.42 × 5,379.34
4. Step 4: Simplify right side
   9,628.81x = 71,472,144.64
5. Step 5: Solve for x
   x = 71,472,144.64/9,628.81
6. Step 6: Final answer
   x = 7,422.74