Finding the Fourth Proportional to 9,521.52, 13,139.28 and 5,745.60

Step by Step Solution

1. Step 1: Write the proportion equation
   9,521.52 : 13,139.28 = 5,745.60 : x
2. Step 2: Convert to fraction form
   9,521.52/13,139.28 = 5,745.60/x
3. Step 3: Cross multiply
   9,521.52x = 13,139.28 × 5,745.60
4. Step 4: Simplify right side
   9,521.52x = 75,493,047.17
5. Step 5: Solve for x
   x = 75,493,047.17/9,521.52
6. Step 6: Final answer
   x = 7,928.68