Finding the Fourth Proportional to 8,724.72, 13,087.89 and 3,178.65

Step by Step Solution

1. Step 1: Write the proportion equation
   8,724.72 : 13,087.89 = 3,178.65 : x
2. Step 2: Convert to fraction form
   8,724.72/13,087.89 = 3,178.65/x
3. Step 3: Cross multiply
   8,724.72x = 13,087.89 × 3,178.65
4. Step 4: Simplify right side
   8,724.72x = 41,601,821.55
5. Step 5: Solve for x
   x = 41,601,821.55/8,724.72
6. Step 6: Final answer
   x = 4,768.27