Finding the Fourth Proportional to 9,628.56, 13,287.30 and 5,379.35

Step by Step Solution

1. Step 1: Write the proportion equation
   9,628.56 : 13,287.30 = 5,379.35 : x
2. Step 2: Convert to fraction form
   9,628.56/13,287.30 = 5,379.35/x
3. Step 3: Cross multiply
   9,628.56x = 13,287.30 × 5,379.35
4. Step 4: Simplify right side
   9,628.56x = 71,477,037.26
5. Step 5: Solve for x
   x = 71,477,037.26/9,628.56
6. Step 6: Final answer
   x = 7,423.44