Finding the Fourth Proportional to 8,899.76, 12,289.83 and 7,144.22

Step by Step Solution

1. Step 1: Write the proportion equation
   8,899.76 : 12,289.83 = 7,144.22 : x
2. Step 2: Convert to fraction form
   8,899.76/12,289.83 = 7,144.22/x
3. Step 3: Cross multiply
   8,899.76x = 12,289.83 × 7,144.22
4. Step 4: Simplify right side
   8,899.76x = 87,801,253.22
5. Step 5: Solve for x
   x = 87,801,253.22/8,899.76
6. Step 6: Final answer
   x = 9,865.57