Finding the Fourth Proportional to 1,445.52, 1,993.56 and 1,003.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.52 : 1,993.56 = 1,003.20 : x
2. Step 2: Convert to fraction form
   1,445.52/1,993.56 = 1,003.20/x
3. Step 3: Cross multiply
   1,445.52x = 1,993.56 × 1,003.20
4. Step 4: Simplify right side
   1,445.52x = 1,999,939.39
5. Step 5: Solve for x
   x = 1,999,939.39/1,445.52
6. Step 6: Final answer
   x = 1,383.54