Finding the Fourth Proportional to 1,379.16, 1,902.57 and 789.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.16 : 1,902.57 = 789.54 : x
2. Step 2: Convert to fraction form
   1,379.16/1,902.57 = 789.54/x
3. Step 3: Cross multiply
   1,379.16x = 1,902.57 × 789.54
4. Step 4: Simplify right side
   1,379.16x = 1,502,155.12
5. Step 5: Solve for x
   x = 1,502,155.12/1,379.16
6. Step 6: Final answer
   x = 1,089.18