Finding the Fourth Proportional to 8,478.12, 12,708.81 and 3,551.16

Step by Step Solution

1. Step 1: Write the proportion equation
   8,478.12 : 12,708.81 = 3,551.16 : x
2. Step 2: Convert to fraction form
   8,478.12/12,708.81 = 3,551.16/x
3. Step 3: Cross multiply
   8,478.12x = 12,708.81 × 3,551.16
4. Step 4: Simplify right side
   8,478.12x = 45,131,017.72
5. Step 5: Solve for x
   x = 45,131,017.72/8,478.12
6. Step 6: Final answer
   x = 5,323.23