Finding the Fourth Proportional to 9,825.12, 13,530.24 and 9,630.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,825.12 : 13,530.24 = 9,630.72 : x
2. Step 2: Convert to fraction form
   9,825.12/13,530.24 = 9,630.72/x
3. Step 3: Cross multiply
   9,825.12x = 13,530.24 × 9,630.72
4. Step 4: Simplify right side
   9,825.12x = 130,305,952.97
5. Step 5: Solve for x
   x = 130,305,952.97/9,825.12
6. Step 6: Final answer
   x = 13,262.53