Finding the Fourth Proportional to 1,419.48, 1,958.80 and 789.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,419.48 : 1,958.80 = 789.96 : x
2. Step 2: Convert to fraction form
   1,419.48/1,958.80 = 789.96/x
3. Step 3: Cross multiply
   1,419.48x = 1,958.80 × 789.96
4. Step 4: Simplify right side
   1,419.48x = 1,547,373.65
5. Step 5: Solve for x
   x = 1,547,373.65/1,419.48
6. Step 6: Final answer
   x = 1,090.10