Finding the Fourth Proportional to 3,859.15, 5,786.49 and 3,397.86

Step by Step Solution

1. Step 1: Write the proportion equation
   3,859.15 : 5,786.49 = 3,397.86 : x
2. Step 2: Convert to fraction form
   3,859.15/5,786.49 = 3,397.86/x
3. Step 3: Cross multiply
   3,859.15x = 5,786.49 × 3,397.86
4. Step 4: Simplify right side
   3,859.15x = 19,661,653.98
5. Step 5: Solve for x
   x = 19,661,653.98/3,859.15
6. Step 6: Final answer
   x = 5,094.81