Finding the Fourth Proportional to 9,581.25, 13,223.34 and 5,390.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,581.25 : 13,223.34 = 5,390.31 : x
2. Step 2: Convert to fraction form
   9,581.25/13,223.34 = 5,390.31/x
3. Step 3: Cross multiply
   9,581.25x = 13,223.34 × 5,390.31
4. Step 4: Simplify right side
   9,581.25x = 71,277,901.84
5. Step 5: Solve for x
   x = 71,277,901.84/9,581.25
6. Step 6: Final answer
   x = 7,439.31