Finding the Fourth Proportional to 8,619.69, 12,918.72 and 3,683.55

Step by Step Solution

1. Step 1: Write the proportion equation
   8,619.69 : 12,918.72 = 3,683.55 : x
2. Step 2: Convert to fraction form
   8,619.69/12,918.72 = 3,683.55/x
3. Step 3: Cross multiply
   8,619.69x = 12,918.72 × 3,683.55
4. Step 4: Simplify right side
   8,619.69x = 47,586,751.06
5. Step 5: Solve for x
   x = 47,586,751.06/8,619.69
6. Step 6: Final answer
   x = 5,520.70