Finding the Fourth Proportional to 8,667.36, 13,002.72 and 3,121.44

Step by Step Solution

1. Step 1: Write the proportion equation
   8,667.36 : 13,002.72 = 3,121.44 : x
2. Step 2: Convert to fraction form
   8,667.36/13,002.72 = 3,121.44/x
3. Step 3: Cross multiply
   8,667.36x = 13,002.72 × 3,121.44
4. Step 4: Simplify right side
   8,667.36x = 40,587,210.32
5. Step 5: Solve for x
   x = 40,587,210.32/8,667.36
6. Step 6: Final answer
   x = 4,682.77