Finding the Fourth Proportional to 9,367.68, 12,928.68 and 5,388.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,367.68 : 12,928.68 = 5,388.72 : x
2. Step 2: Convert to fraction form
   9,367.68/12,928.68 = 5,388.72/x
3. Step 3: Cross multiply
   9,367.68x = 12,928.68 × 5,388.72
4. Step 4: Simplify right side
   9,367.68x = 69,669,036.49
5. Step 5: Solve for x
   x = 69,669,036.49/9,367.68
6. Step 6: Final answer
   x = 7,437.17