Finding the Fourth Proportional to 9,009.12, 13,485.72 and 8,243.64

Step by Step Solution

1. Step 1: Write the proportion equation
   9,009.12 : 13,485.72 = 8,243.64 : x
2. Step 2: Convert to fraction form
   9,009.12/13,485.72 = 8,243.64/x
3. Step 3: Cross multiply
   9,009.12x = 13,485.72 × 8,243.64
4. Step 4: Simplify right side
   9,009.12x = 111,171,420.82
5. Step 5: Solve for x
   x = 111,171,420.82/9,009.12
6. Step 6: Final answer
   x = 12,339.88