Finding the Fourth Proportional to 1,348.91, 1,861.40 and 789.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,348.91 : 1,861.40 = 789.35 : x
2. Step 2: Convert to fraction form
   1,348.91/1,861.40 = 789.35/x
3. Step 3: Cross multiply
   1,348.91x = 1,861.40 × 789.35
4. Step 4: Simplify right side
   1,348.91x = 1,469,288.76
5. Step 5: Solve for x
   x = 1,469,288.76/1,348.91
6. Step 6: Final answer
   x = 1,089.24