Finding the Fourth Proportional to 1,419.32, 1,958.78 and 789.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,419.32 : 1,958.78 = 789.98 : x
2. Step 2: Convert to fraction form
   1,419.32/1,958.78 = 789.98/x
3. Step 3: Cross multiply
   1,419.32x = 1,958.78 × 789.98
4. Step 4: Simplify right side
   1,419.32x = 1,547,389.21
5. Step 5: Solve for x
   x = 1,547,389.21/1,419.32
6. Step 6: Final answer
   x = 1,090.23