Finding the Fourth Proportional to 9,520.36, 13,129.95 and 5,742.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,520.36 : 13,129.95 = 5,742.72 : x
2. Step 2: Convert to fraction form
   9,520.36/13,129.95 = 5,742.72/x
3. Step 3: Cross multiply
   9,520.36x = 13,129.95 × 5,742.72
4. Step 4: Simplify right side
   9,520.36x = 75,401,648.00
5. Step 5: Solve for x
   x = 75,401,648.00/9,520.36
6. Step 6: Final answer
   x = 7,920.04