Finding the Fourth Proportional to 1,379.32, 1,903.16 and 789.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.32 : 1,903.16 = 789.74 : x
2. Step 2: Convert to fraction form
   1,379.32/1,903.16 = 789.74/x
3. Step 3: Cross multiply
   1,379.32x = 1,903.16 × 789.74
4. Step 4: Simplify right side
   1,379.32x = 1,503,001.58
5. Step 5: Solve for x
   x = 1,503,001.58/1,379.32
6. Step 6: Final answer
   x = 1,089.67