Finding the Fourth Proportional to 8,620.72, 12,928.62 and 2,379.16

Step by Step Solution

1. Step 1: Write the proportion equation
   8,620.72 : 12,928.62 = 2,379.16 : x
2. Step 2: Convert to fraction form
   8,620.72/12,928.62 = 2,379.16/x
3. Step 3: Cross multiply
   8,620.72x = 12,928.62 × 2,379.16
4. Step 4: Simplify right side
   8,620.72x = 30,759,255.56
5. Step 5: Solve for x
   x = 30,759,255.56/8,620.72
6. Step 6: Final answer
   x = 3,568.06