Finding the Fourth Proportional to 8,209.96, 12,303.59 and 7,111.60

Step by Step Solution

1. Step 1: Write the proportion equation
   8,209.96 : 12,303.59 = 7,111.60 : x
2. Step 2: Convert to fraction form
   8,209.96/12,303.59 = 7,111.60/x
3. Step 3: Cross multiply
   8,209.96x = 12,303.59 × 7,111.60
4. Step 4: Simplify right side
   8,209.96x = 87,498,144.33
5. Step 5: Solve for x
   x = 87,498,144.33/8,209.96
6. Step 6: Final answer
   x = 10,657.56