Finding the Fourth Proportional to 1,348.77, 1,860.94 and 789.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,348.77 : 1,860.94 = 789.38 : x
2. Step 2: Convert to fraction form
   1,348.77/1,860.94 = 789.38/x
3. Step 3: Cross multiply
   1,348.77x = 1,860.94 × 789.38
4. Step 4: Simplify right side
   1,348.77x = 1,468,975.57
5. Step 5: Solve for x
   x = 1,468,975.57/1,348.77
6. Step 6: Final answer
   x = 1,089.12