Finding the Fourth Proportional to 9,628.72, 13,286.32 and 5,379.26

Step by Step Solution

1. Step 1: Write the proportion equation
   9,628.72 : 13,286.32 = 5,379.26 : x
2. Step 2: Convert to fraction form
   9,628.72/13,286.32 = 5,379.26/x
3. Step 3: Cross multiply
   9,628.72x = 13,286.32 × 5,379.26
4. Step 4: Simplify right side
   9,628.72x = 71,470,569.72
5. Step 5: Solve for x
   x = 71,470,569.72/9,628.72
6. Step 6: Final answer
   x = 7,422.64