Finding the Fourth Proportional to 9,520.80, 13,139.12 and 5,329.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,520.80 : 13,139.12 = 5,329.12 : x
2. Step 2: Convert to fraction form
   9,520.80/13,139.12 = 5,329.12/x
3. Step 3: Cross multiply
   9,520.80x = 13,139.12 × 5,329.12
4. Step 4: Simplify right side
   9,520.80x = 70,019,947.17
5. Step 5: Solve for x
   x = 70,019,947.17/9,520.80
6. Step 6: Final answer
   x = 7,354.42