Finding the Fourth Proportional to 1,378.62, 1,902.42 and 789.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,378.62 : 1,902.42 = 789.08 : x
2. Step 2: Convert to fraction form
   1,378.62/1,902.42 = 789.08/x
3. Step 3: Cross multiply
   1,378.62x = 1,902.42 × 789.08
4. Step 4: Simplify right side
   1,378.62x = 1,501,152.06
5. Step 5: Solve for x
   x = 1,501,152.06/1,378.62
6. Step 6: Final answer
   x = 1,088.88