Finding the Fourth Proportional to 12,321.75, 17,003.60 and 7,786.85

Step by Step Solution

1. Step 1: Write the proportion equation
   12,321.75 : 17,003.60 = 7,786.85 : x
2. Step 2: Convert to fraction form
   12,321.75/17,003.60 = 7,786.85/x
3. Step 3: Cross multiply
   12,321.75x = 17,003.60 × 7,786.85
4. Step 4: Simplify right side
   12,321.75x = 132,404,543.30
5. Step 5: Solve for x
   x = 132,404,543.30/12,321.75
6. Step 6: Final answer
   x = 10,745.60