Finding the Fourth Proportional to 12,391.89, 17,101.99 and 7,085.67

Step by Step Solution

1. Step 1: Write the proportion equation
   12,391.89 : 17,101.99 = 7,085.67 : x
2. Step 2: Convert to fraction form
   12,391.89/17,101.99 = 7,085.67/x
3. Step 3: Cross multiply
   12,391.89x = 17,101.99 × 7,085.67
4. Step 4: Simplify right side
   12,391.89x = 121,179,057.48
5. Step 5: Solve for x
   x = 121,179,057.48/12,391.89
6. Step 6: Final answer
   x = 9,778.90