Finding the Fourth Proportional to 1,443.15, 1,990.62 and 1,203.26

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.15 : 1,990.62 = 1,203.26 : x
2. Step 2: Convert to fraction form
   1,443.15/1,990.62 = 1,203.26/x
3. Step 3: Cross multiply
   1,443.15x = 1,990.62 × 1,203.26
4. Step 4: Simplify right side
   1,443.15x = 2,395,223.47
5. Step 5: Solve for x
   x = 2,395,223.47/1,443.15
6. Step 6: Final answer
   x = 1,659.72