Finding the Fourth Proportional to 8,667.60, 12,975.87 and 5,370.09

Step by Step Solution

1. Step 1: Write the proportion equation
   8,667.60 : 12,975.87 = 5,370.09 : x
2. Step 2: Convert to fraction form
   8,667.60/12,975.87 = 5,370.09/x
3. Step 3: Cross multiply
   8,667.60x = 12,975.87 × 5,370.09
4. Step 4: Simplify right side
   8,667.60x = 69,681,589.73
5. Step 5: Solve for x
   x = 69,681,589.73/8,667.60
6. Step 6: Final answer
   x = 8,039.32