Finding the Fourth Proportional to 9,288.72, 12,809.88 and 8,618.04

Step by Step Solution

1. Step 1: Write the proportion equation
   9,288.72 : 12,809.88 = 8,618.04 : x
2. Step 2: Convert to fraction form
   9,288.72/12,809.88 = 8,618.04/x
3. Step 3: Cross multiply
   9,288.72x = 12,809.88 × 8,618.04
4. Step 4: Simplify right side
   9,288.72x = 110,396,058.24
5. Step 5: Solve for x
   x = 110,396,058.24/9,288.72
6. Step 6: Final answer
   x = 11,884.96