Finding the Fourth Proportional to 8,786.77, 12,129.71 and 5,604.34

Step by Step Solution

1. Step 1: Write the proportion equation
   8,786.77 : 12,129.71 = 5,604.34 : x
2. Step 2: Convert to fraction form
   8,786.77/12,129.71 = 5,604.34/x
3. Step 3: Cross multiply
   8,786.77x = 12,129.71 × 5,604.34
4. Step 4: Simplify right side
   8,786.77x = 67,979,018.94
5. Step 5: Solve for x
   x = 67,979,018.94/8,786.77
6. Step 6: Final answer
   x = 7,736.52