Finding the Fourth Proportional to 1,983.42, 2,979.69 and 1,399.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,983.42 : 2,979.69 = 1,399.77 : x
2. Step 2: Convert to fraction form
   1,983.42/2,979.69 = 1,399.77/x
3. Step 3: Cross multiply
   1,983.42x = 2,979.69 × 1,399.77
4. Step 4: Simplify right side
   1,983.42x = 4,170,865.77
5. Step 5: Solve for x
   x = 4,170,865.77/1,983.42
6. Step 6: Final answer
   x = 2,102.87