Finding the Fourth Proportional to 8,854.20, 12,221.88 and 5,499.60

Step by Step Solution

1. Step 1: Write the proportion equation
   8,854.20 : 12,221.88 = 5,499.60 : x
2. Step 2: Convert to fraction form
   8,854.20/12,221.88 = 5,499.60/x
3. Step 3: Cross multiply
   8,854.20x = 12,221.88 × 5,499.60
4. Step 4: Simplify right side
   8,854.20x = 67,215,451.25
5. Step 5: Solve for x
   x = 67,215,451.25/8,854.20
6. Step 6: Final answer
   x = 7,591.36