Finding the Fourth Proportional to 8,723.72, 13,086.10 and 2,880.38

Step by Step Solution

1. Step 1: Write the proportion equation
   8,723.72 : 13,086.10 = 2,880.38 : x
2. Step 2: Convert to fraction form
   8,723.72/13,086.10 = 2,880.38/x
3. Step 3: Cross multiply
   8,723.72x = 13,086.10 × 2,880.38
4. Step 4: Simplify right side
   8,723.72x = 37,692,940.72
5. Step 5: Solve for x
   x = 37,692,940.72/8,723.72
6. Step 6: Final answer
   x = 4,320.74