Finding the Fourth Proportional to 1,443.51, 1,991.79 and 822.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.51 : 1,991.79 = 822.51 : x
2. Step 2: Convert to fraction form
   1,443.51/1,991.79 = 822.51/x
3. Step 3: Cross multiply
   1,443.51x = 1,991.79 × 822.51
4. Step 4: Simplify right side
   1,443.51x = 1,638,267.19
5. Step 5: Solve for x
   x = 1,638,267.19/1,443.51
6. Step 6: Final answer
   x = 1,134.92