Finding the Fourth Proportional to 11,356.72, 17,019.52 and 8,581.12

Step by Step Solution

1. Step 1: Write the proportion equation
   11,356.72 : 17,019.52 = 8,581.12 : x
2. Step 2: Convert to fraction form
   11,356.72/17,019.52 = 8,581.12/x
3. Step 3: Cross multiply
   11,356.72x = 17,019.52 × 8,581.12
4. Step 4: Simplify right side
   11,356.72x = 146,046,543.46
5. Step 5: Solve for x
   x = 146,046,543.46/11,356.72
6. Step 6: Final answer
   x = 12,859.92