Finding the Fourth Proportional to 8,485.12, 12,729.52 and 3,558.94

Step by Step Solution

1. Step 1: Write the proportion equation
   8,485.12 : 12,729.52 = 3,558.94 : x
2. Step 2: Convert to fraction form
   8,485.12/12,729.52 = 3,558.94/x
3. Step 3: Cross multiply
   8,485.12x = 12,729.52 × 3,558.94
4. Step 4: Simplify right side
   8,485.12x = 45,303,597.91
5. Step 5: Solve for x
   x = 45,303,597.91/8,485.12
6. Step 6: Final answer
   x = 5,339.18