Finding the Fourth Proportional to 9,580.25, 13,221.56 and 5,389.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,580.25 : 13,221.56 = 5,389.31 : x
2. Step 2: Convert to fraction form
   9,580.25/13,221.56 = 5,389.31/x
3. Step 3: Cross multiply
   9,580.25x = 13,221.56 × 5,389.31
4. Step 4: Simplify right side
   9,580.25x = 71,255,085.52
5. Step 5: Solve for x
   x = 71,255,085.52/9,580.25
6. Step 6: Final answer
   x = 7,437.71