Finding the Fourth Proportional to 9,628.61, 13,287.49 and 5,379.68

Step by Step Solution

1. Step 1: Write the proportion equation
   9,628.61 : 13,287.49 = 5,379.68 : x
2. Step 2: Convert to fraction form
   9,628.61/13,287.49 = 5,379.68/x
3. Step 3: Cross multiply
   9,628.61x = 13,287.49 × 5,379.68
4. Step 4: Simplify right side
   9,628.61x = 71,482,384.49
5. Step 5: Solve for x
   x = 71,482,384.49/9,628.61
6. Step 6: Final answer
   x = 7,423.96