Finding the Fourth Proportional to 1,419.19, 1,958.47 and 789.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,419.19 : 1,958.47 = 789.72 : x
2. Step 2: Convert to fraction form
   1,419.19/1,958.47 = 789.72/x
3. Step 3: Cross multiply
   1,419.19x = 1,958.47 × 789.72
4. Step 4: Simplify right side
   1,419.19x = 1,546,633.53
5. Step 5: Solve for x
   x = 1,546,633.53/1,419.19
6. Step 6: Final answer
   x = 1,089.80