Finding the Fourth Proportional to 9,521.36, 13,139.51 and 5,329.61

Step by Step Solution

1. Step 1: Write the proportion equation
   9,521.36 : 13,139.51 = 5,329.61 : x
2. Step 2: Convert to fraction form
   9,521.36/13,139.51 = 5,329.61/x
3. Step 3: Cross multiply
   9,521.36x = 13,139.51 × 5,329.61
4. Step 4: Simplify right side
   9,521.36x = 70,028,371.55
5. Step 5: Solve for x
   x = 70,028,371.55/9,521.36
6. Step 6: Final answer
   x = 7,354.87