Finding the Fourth Proportional to 9,235.72, 12,745.88 and 5,257.60

Step by Step Solution

1. Step 1: Write the proportion equation
   9,235.72 : 12,745.88 = 5,257.60 : x
2. Step 2: Convert to fraction form
   9,235.72/12,745.88 = 5,257.60/x
3. Step 3: Cross multiply
   9,235.72x = 12,745.88 × 5,257.60
4. Step 4: Simplify right side
   9,235.72x = 67,012,738.69
5. Step 5: Solve for x
   x = 67,012,738.69/9,235.72
6. Step 6: Final answer
   x = 7,255.82