Finding the Fourth Proportional to 1,320.30, 1,822.06 and 789.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.30 : 1,822.06 = 789.18 : x
2. Step 2: Convert to fraction form
   1,320.30/1,822.06 = 789.18/x
3. Step 3: Cross multiply
   1,320.30x = 1,822.06 × 789.18
4. Step 4: Simplify right side
   1,320.30x = 1,437,933.31
5. Step 5: Solve for x
   x = 1,437,933.31/1,320.30
6. Step 6: Final answer
   x = 1,089.10