Finding the Fourth Proportional to 1,348.74, 1,860.64 and 789.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,348.74 : 1,860.64 = 789.23 : x
2. Step 2: Convert to fraction form
   1,348.74/1,860.64 = 789.23/x
3. Step 3: Cross multiply
   1,348.74x = 1,860.64 × 789.23
4. Step 4: Simplify right side
   1,348.74x = 1,468,475.59
5. Step 5: Solve for x
   x = 1,468,475.59/1,348.74
6. Step 6: Final answer
   x = 1,088.78