Finding the Fourth Proportional to 8,789.92, 12,113.72 and 7,208.80

Step by Step Solution

1. Step 1: Write the proportion equation
   8,789.92 : 12,113.72 = 7,208.80 : x
2. Step 2: Convert to fraction form
   8,789.92/12,113.72 = 7,208.80/x
3. Step 3: Cross multiply
   8,789.92x = 12,113.72 × 7,208.80
4. Step 4: Simplify right side
   8,789.92x = 87,325,384.74
5. Step 5: Solve for x
   x = 87,325,384.74/8,789.92
6. Step 6: Final answer
   x = 9,934.72