Finding the Fourth Proportional to 1,439.10, 1,983.72 and 1,203.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.10 : 1,983.72 = 1,203.83 : x
2. Step 2: Convert to fraction form
   1,439.10/1,983.72 = 1,203.83/x
3. Step 3: Cross multiply
   1,439.10x = 1,983.72 × 1,203.83
4. Step 4: Simplify right side
   1,439.10x = 2,388,063.68
5. Step 5: Solve for x
   x = 2,388,063.68/1,439.10
6. Step 6: Final answer
   x = 1,659.41