Finding the Fourth Proportional to 1,443.00, 1,990.78 and 813.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.00 : 1,990.78 = 813.37 : x
2. Step 2: Convert to fraction form
   1,443.00/1,990.78 = 813.37/x
3. Step 3: Cross multiply
   1,443.00x = 1,990.78 × 813.37
4. Step 4: Simplify right side
   1,443.00x = 1,619,231.85
5. Step 5: Solve for x
   x = 1,619,231.85/1,443.00
6. Step 6: Final answer
   x = 1,122.13