Finding the Fourth Proportional to 8,221.78, 12,336.18 and 5,449.42

Step by Step Solution

1. Step 1: Write the proportion equation
   8,221.78 : 12,336.18 = 5,449.42 : x
2. Step 2: Convert to fraction form
   8,221.78/12,336.18 = 5,449.42/x
3. Step 3: Cross multiply
   8,221.78x = 12,336.18 × 5,449.42
4. Step 4: Simplify right side
   8,221.78x = 67,225,026.02
5. Step 5: Solve for x
   x = 67,225,026.02/8,221.78
6. Step 6: Final answer
   x = 8,176.46