Finding the Fourth Proportional to 8,478.72, 12,723.71 and 3,485.18

Step by Step Solution

1. Step 1: Write the proportion equation
   8,478.72 : 12,723.71 = 3,485.18 : x
2. Step 2: Convert to fraction form
   8,478.72/12,723.71 = 3,485.18/x
3. Step 3: Cross multiply
   8,478.72x = 12,723.71 × 3,485.18
4. Step 4: Simplify right side
   8,478.72x = 44,344,434.00
5. Step 5: Solve for x
   x = 44,344,434.00/8,478.72
6. Step 6: Final answer
   x = 5,230.09