Finding the Fourth Proportional to 1,442.82, 1,991.01 and 813.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,442.82 : 1,991.01 = 813.33 : x
2. Step 2: Convert to fraction form
   1,442.82/1,991.01 = 813.33/x
3. Step 3: Cross multiply
   1,442.82x = 1,991.01 × 813.33
4. Step 4: Simplify right side
   1,442.82x = 1,619,348.16
5. Step 5: Solve for x
   x = 1,619,348.16/1,442.82
6. Step 6: Final answer
   x = 1,122.35