Finding the Fourth Proportional to 1,349.37, 1,861.84 and 789.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,349.37 : 1,861.84 = 789.89 : x
2. Step 2: Convert to fraction form
   1,349.37/1,861.84 = 789.89/x
3. Step 3: Cross multiply
   1,349.37x = 1,861.84 × 789.89
4. Step 4: Simplify right side
   1,349.37x = 1,470,648.80
5. Step 5: Solve for x
   x = 1,470,648.80/1,349.37
6. Step 6: Final answer
   x = 1,089.88