Finding the Fourth Proportional to 8,855.12, 12,221.22 and 5,720.42

Step by Step Solution

1. Step 1: Write the proportion equation
   8,855.12 : 12,221.22 = 5,720.42 : x
2. Step 2: Convert to fraction form
   8,855.12/12,221.22 = 5,720.42/x
3. Step 3: Cross multiply
   8,855.12x = 12,221.22 × 5,720.42
4. Step 4: Simplify right side
   8,855.12x = 69,910,511.31
5. Step 5: Solve for x
   x = 69,910,511.31/8,855.12
6. Step 6: Final answer
   x = 7,894.93