Finding the Fourth Proportional to 8,205.83, 12,311.81 and 4,921.28

Step by Step Solution

1. Step 1: Write the proportion equation
   8,205.83 : 12,311.81 = 4,921.28 : x
2. Step 2: Convert to fraction form
   8,205.83/12,311.81 = 4,921.28/x
3. Step 3: Cross multiply
   8,205.83x = 12,311.81 × 4,921.28
4. Step 4: Simplify right side
   8,205.83x = 60,589,864.32
5. Step 5: Solve for x
   x = 60,589,864.32/8,205.83
6. Step 6: Final answer
   x = 7,383.76