Finding the Fourth Proportional to 11,786.72, 17,682.69 and 3,891.67

Step by Step Solution

1. Step 1: Write the proportion equation
   11,786.72 : 17,682.69 = 3,891.67 : x
2. Step 2: Convert to fraction form
   11,786.72/17,682.69 = 3,891.67/x
3. Step 3: Cross multiply
   11,786.72x = 17,682.69 × 3,891.67
4. Step 4: Simplify right side
   11,786.72x = 68,815,194.19
5. Step 5: Solve for x
   x = 68,815,194.19/11,786.72
6. Step 6: Final answer
   x = 5,838.37