Finding the Fourth Proportional to 9,580.16, 13,222.40 and 5,388.40

Step by Step Solution

1. Step 1: Write the proportion equation
   9,580.16 : 13,222.40 = 5,388.40 : x
2. Step 2: Convert to fraction form
   9,580.16/13,222.40 = 5,388.40/x
3. Step 3: Cross multiply
   9,580.16x = 13,222.40 × 5,388.40
4. Step 4: Simplify right side
   9,580.16x = 71,247,580.16
5. Step 5: Solve for x
   x = 71,247,580.16/9,580.16
6. Step 6: Final answer
   x = 7,436.99