Finding the Fourth Proportional to 9,628.89, 13,287.38 and 5,379.10

Step by Step Solution

1. Step 1: Write the proportion equation
   9,628.89 : 13,287.38 = 5,379.10 : x
2. Step 2: Convert to fraction form
   9,628.89/13,287.38 = 5,379.10/x
3. Step 3: Cross multiply
   9,628.89x = 13,287.38 × 5,379.10
4. Step 4: Simplify right side
   9,628.89x = 71,474,085.64
5. Step 5: Solve for x
   x = 71,474,085.64/9,628.89
6. Step 6: Final answer
   x = 7,422.88