Finding the Fourth Proportional to 9,580.95, 13,221.57 and 5,389.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,580.95 : 13,221.57 = 5,389.20 : x
2. Step 2: Convert to fraction form
   9,580.95/13,221.57 = 5,389.20/x
3. Step 3: Cross multiply
   9,580.95x = 13,221.57 × 5,389.20
4. Step 4: Simplify right side
   9,580.95x = 71,253,685.04
5. Step 5: Solve for x
   x = 71,253,685.04/9,580.95
6. Step 6: Final answer
   x = 7,437.02