Finding the Fourth Proportional to 1,349.22, 1,861.28 and 789.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,349.22 : 1,861.28 = 789.71 : x
2. Step 2: Convert to fraction form
   1,349.22/1,861.28 = 789.71/x
3. Step 3: Cross multiply
   1,349.22x = 1,861.28 × 789.71
4. Step 4: Simplify right side
   1,349.22x = 1,469,871.43
5. Step 5: Solve for x
   x = 1,469,871.43/1,349.22
6. Step 6: Final answer
   x = 1,089.42