Finding the Fourth Proportional to 12,391.41, 17,099.69 and 7,086.09

Step by Step Solution

1. Step 1: Write the proportion equation
   12,391.41 : 17,099.69 = 7,086.09 : x
2. Step 2: Convert to fraction form
   12,391.41/17,099.69 = 7,086.09/x
3. Step 3: Cross multiply
   12,391.41x = 17,099.69 × 7,086.09
4. Step 4: Simplify right side
   12,391.41x = 121,169,906.88
5. Step 5: Solve for x
   x = 121,169,906.88/12,391.41
6. Step 6: Final answer
   x = 9,778.54