Finding the Fourth Proportional to 8,861.56, 13,287.94 and 5,164.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,861.56 : 13,287.94 = 5,164.72 : x
2. Step 2: Convert to fraction form
   8,861.56/13,287.94 = 5,164.72/x
3. Step 3: Cross multiply
   8,861.56x = 13,287.94 × 5,164.72
4. Step 4: Simplify right side
   8,861.56x = 68,628,489.48
5. Step 5: Solve for x
   x = 68,628,489.48/8,861.56
6. Step 6: Final answer
   x = 7,744.52