Finding the Fourth Proportional to 3,990.89, 5,986.37 and 1,393.83

Step by Step Solution

1. Step 1: Write the proportion equation
   3,990.89 : 5,986.37 = 1,393.83 : x
2. Step 2: Convert to fraction form
   3,990.89/5,986.37 = 1,393.83/x
3. Step 3: Cross multiply
   3,990.89x = 5,986.37 × 1,393.83
4. Step 4: Simplify right side
   3,990.89x = 8,343,982.10
5. Step 5: Solve for x
   x = 8,343,982.10/3,990.89
6. Step 6: Final answer
   x = 2,090.76