Finding the Fourth Proportional to 1,379.23, 1,903.50 and 789.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.23 : 1,903.50 = 789.95 : x
2. Step 2: Convert to fraction form
   1,379.23/1,903.50 = 789.95/x
3. Step 3: Cross multiply
   1,379.23x = 1,903.50 × 789.95
4. Step 4: Simplify right side
   1,379.23x = 1,503,669.83
5. Step 5: Solve for x
   x = 1,503,669.83/1,379.23
6. Step 6: Final answer
   x = 1,090.22