Finding the Fourth Proportional to 3,991.33, 5,986.86 and 1,217.89

Step by Step Solution

1. Step 1: Write the proportion equation
   3,991.33 : 5,986.86 = 1,217.89 : x
2. Step 2: Convert to fraction form
   3,991.33/5,986.86 = 1,217.89/x
3. Step 3: Cross multiply
   3,991.33x = 5,986.86 × 1,217.89
4. Step 4: Simplify right side
   3,991.33x = 7,291,336.93
5. Step 5: Solve for x
   x = 7,291,336.93/3,991.33
6. Step 6: Final answer
   x = 1,826.79