Finding the Fourth Proportional to 1,443.03, 1,991.35 and 813.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.03 : 1,991.35 = 813.54 : x
2. Step 2: Convert to fraction form
   1,443.03/1,991.35 = 813.54/x
3. Step 3: Cross multiply
   1,443.03x = 1,991.35 × 813.54
4. Step 4: Simplify right side
   1,443.03x = 1,620,042.88
5. Step 5: Solve for x
   x = 1,620,042.88/1,443.03
6. Step 6: Final answer
   x = 1,122.67