Finding the Fourth Proportional to 8,863.56, 13,290.96 and 5,166.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,863.56 : 13,290.96 = 5,166.72 : x
2. Step 2: Convert to fraction form
   8,863.56/13,290.96 = 5,166.72/x
3. Step 3: Cross multiply
   8,863.56x = 13,290.96 × 5,166.72
4. Step 4: Simplify right side
   8,863.56x = 68,670,668.85
5. Step 5: Solve for x
   x = 68,670,668.85/8,863.56
6. Step 6: Final answer
   x = 7,747.53