Finding the Fourth Proportional to 1,348.79, 1,861.35 and 789.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,348.79 : 1,861.35 = 789.59 : x
2. Step 2: Convert to fraction form
   1,348.79/1,861.35 = 789.59/x
3. Step 3: Cross multiply
   1,348.79x = 1,861.35 × 789.59
4. Step 4: Simplify right side
   1,348.79x = 1,469,708.00
5. Step 5: Solve for x
   x = 1,469,708.00/1,348.79
6. Step 6: Final answer
   x = 1,089.65