Finding the Fourth Proportional to 1,379.34, 1,903.39 and 789.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.34 : 1,903.39 = 789.86 : x
2. Step 2: Convert to fraction form
   1,379.34/1,903.39 = 789.86/x
3. Step 3: Cross multiply
   1,379.34x = 1,903.39 × 789.86
4. Step 4: Simplify right side
   1,379.34x = 1,503,411.63
5. Step 5: Solve for x
   x = 1,503,411.63/1,379.34
6. Step 6: Final answer
   x = 1,089.95