Finding the Fourth Proportional to 1,443.34, 1,991.91 and 822.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.34 : 1,991.91 = 822.34 : x
2. Step 2: Convert to fraction form
   1,443.34/1,991.91 = 822.34/x
3. Step 3: Cross multiply
   1,443.34x = 1,991.91 × 822.34
4. Step 4: Simplify right side
   1,443.34x = 1,638,027.27
5. Step 5: Solve for x
   x = 1,638,027.27/1,443.34
6. Step 6: Final answer
   x = 1,134.89