Finding the Fourth Proportional to 9,628.87, 13,287.68 and 5,380.02

Step by Step Solution

1. Step 1: Write the proportion equation
   9,628.87 : 13,287.68 = 5,380.02 : x
2. Step 2: Convert to fraction form
   9,628.87/13,287.68 = 5,380.02/x
3. Step 3: Cross multiply
   9,628.87x = 13,287.68 × 5,380.02
4. Step 4: Simplify right side
   9,628.87x = 71,487,890.82
5. Step 5: Solve for x
   x = 71,487,890.82/9,628.87
6. Step 6: Final answer
   x = 7,424.33