Finding the Fourth Proportional to 8,723.20, 13,021.52 and 8,072.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,723.20 : 13,021.52 = 8,072.72 : x
2. Step 2: Convert to fraction form
   8,723.20/13,021.52 = 8,072.72/x
3. Step 3: Cross multiply
   8,723.20x = 13,021.52 × 8,072.72
4. Step 4: Simplify right side
   8,723.20x = 105,119,084.93
5. Step 5: Solve for x
   x = 105,119,084.93/8,723.20
6. Step 6: Final answer
   x = 12,050.52