Finding the Fourth Proportional to 1,379.22, 1,903.46 and 789.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.22 : 1,903.46 = 789.94 : x
2. Step 2: Convert to fraction form
   1,379.22/1,903.46 = 789.94/x
3. Step 3: Cross multiply
   1,379.22x = 1,903.46 × 789.94
4. Step 4: Simplify right side
   1,379.22x = 1,503,619.19
5. Step 5: Solve for x
   x = 1,503,619.19/1,379.22
6. Step 6: Final answer
   x = 1,090.20