Finding the Fourth Proportional to 1,983.55, 2,979.88 and 1,399.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,983.55 : 2,979.88 = 1,399.89 : x
2. Step 2: Convert to fraction form
   1,983.55/2,979.88 = 1,399.89/x
3. Step 3: Cross multiply
   1,983.55x = 2,979.88 × 1,399.89
4. Step 4: Simplify right side
   1,983.55x = 4,171,500.71
5. Step 5: Solve for x
   x = 4,171,500.71/1,983.55
6. Step 6: Final answer
   x = 2,103.05