Finding the Fourth Proportional to 3,990.89, 5,990.02 and 2,017.91

Step by Step Solution

1. Step 1: Write the proportion equation
   3,990.89 : 5,990.02 = 2,017.91 : x
2. Step 2: Convert to fraction form
   3,990.89/5,990.02 = 2,017.91/x
3. Step 3: Cross multiply
   3,990.89x = 5,990.02 × 2,017.91
4. Step 4: Simplify right side
   3,990.89x = 12,087,293.83
5. Step 5: Solve for x
   x = 12,087,293.83/3,990.89
6. Step 6: Final answer
   x = 3,028.73