Finding the Fourth Proportional to 8,786.88, 12,139.07 and 5,769.16

Step by Step Solution

1. Step 1: Write the proportion equation
   8,786.88 : 12,139.07 = 5,769.16 : x
2. Step 2: Convert to fraction form
   8,786.88/12,139.07 = 5,769.16/x
3. Step 3: Cross multiply
   8,786.88x = 12,139.07 × 5,769.16
4. Step 4: Simplify right side
   8,786.88x = 70,032,177.89
5. Step 5: Solve for x
   x = 70,032,177.89/8,786.88
6. Step 6: Final answer
   x = 7,970.08