Finding the Fourth Proportional to 3,990.76, 5,983.89 and 1,911.27

Step by Step Solution

1. Step 1: Write the proportion equation
   3,990.76 : 5,983.89 = 1,911.27 : x
2. Step 2: Convert to fraction form
   3,990.76/5,983.89 = 1,911.27/x
3. Step 3: Cross multiply
   3,990.76x = 5,983.89 × 1,911.27
4. Step 4: Simplify right side
   3,990.76x = 11,436,829.44
5. Step 5: Solve for x
   x = 11,436,829.44/3,990.76
6. Step 6: Final answer
   x = 2,865.83