Finding the Fourth Proportional to 8,789.88, 12,143.22 and 5,772.16

Step by Step Solution

1. Step 1: Write the proportion equation
   8,789.88 : 12,143.22 = 5,772.16 : x
2. Step 2: Convert to fraction form
   8,789.88/12,143.22 = 5,772.16/x
3. Step 3: Cross multiply
   8,789.88x = 12,143.22 × 5,772.16
4. Step 4: Simplify right side
   8,789.88x = 70,092,608.76
5. Step 5: Solve for x
   x = 70,092,608.76/8,789.88
6. Step 6: Final answer
   x = 7,974.24