Finding the Fourth Proportional to 1,378.85, 1,902.38 and 789.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,378.85 : 1,902.38 = 789.27 : x
2. Step 2: Convert to fraction form
   1,378.85/1,902.38 = 789.27/x
3. Step 3: Cross multiply
   1,378.85x = 1,902.38 × 789.27
4. Step 4: Simplify right side
   1,378.85x = 1,501,480.38
5. Step 5: Solve for x
   x = 1,501,480.38/1,378.85
6. Step 6: Final answer
   x = 1,088.94