Finding the Fourth Proportional to 8,383.56, 12,498.23 and 7,989.88

Step by Step Solution

1. Step 1: Write the proportion equation
   8,383.56 : 12,498.23 = 7,989.88 : x
2. Step 2: Convert to fraction form
   8,383.56/12,498.23 = 7,989.88/x
3. Step 3: Cross multiply
   8,383.56x = 12,498.23 × 7,989.88
4. Step 4: Simplify right side
   8,383.56x = 99,859,357.91
5. Step 5: Solve for x
   x = 99,859,357.91/8,383.56
6. Step 6: Final answer
   x = 11,911.33