Finding the Fourth Proportional to 13,091.91, 18,066.69 and 7,786.82

Step by Step Solution

1. Step 1: Write the proportion equation
   13,091.91 : 18,066.69 = 7,786.82 : x
2. Step 2: Convert to fraction form
   13,091.91/18,066.69 = 7,786.82/x
3. Step 3: Cross multiply
   13,091.91x = 18,066.69 × 7,786.82
4. Step 4: Simplify right side
   13,091.91x = 140,681,972.69
5. Step 5: Solve for x
   x = 140,681,972.69/13,091.91
6. Step 6: Final answer
   x = 10,745.72