Finding the Fourth Proportional to 1,379.46, 1,903.62 and 789.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.46 : 1,903.62 = 789.96 : x
2. Step 2: Convert to fraction form
   1,379.46/1,903.62 = 789.96/x
3. Step 3: Cross multiply
   1,379.46x = 1,903.62 × 789.96
4. Step 4: Simplify right side
   1,379.46x = 1,503,783.66
5. Step 5: Solve for x
   x = 1,503,783.66/1,379.46
6. Step 6: Final answer
   x = 1,090.12