Finding the Fourth Proportional to 8,772.56, 12,111.49 and 5,709.33

Step by Step Solution

1. Step 1: Write the proportion equation
   8,772.56 : 12,111.49 = 5,709.33 : x
2. Step 2: Convert to fraction form
   8,772.56/12,111.49 = 5,709.33/x
3. Step 3: Cross multiply
   8,772.56x = 12,111.49 × 5,709.33
4. Step 4: Simplify right side
   8,772.56x = 69,148,493.20
5. Step 5: Solve for x
   x = 69,148,493.20/8,772.56
6. Step 6: Final answer
   x = 7,882.36