Finding the Fourth Proportional to 1,419.12, 1,958.29 and 789.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,419.12 : 1,958.29 = 789.60 : x
2. Step 2: Convert to fraction form
   1,419.12/1,958.29 = 789.60/x
3. Step 3: Cross multiply
   1,419.12x = 1,958.29 × 789.60
4. Step 4: Simplify right side
   1,419.12x = 1,546,265.78
5. Step 5: Solve for x
   x = 1,546,265.78/1,419.12
6. Step 6: Final answer
   x = 1,089.59