Finding the Fourth Proportional to 1,349.30, 1,862.17 and 789.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,349.30 : 1,862.17 = 789.74 : x
2. Step 2: Convert to fraction form
   1,349.30/1,862.17 = 789.74/x
3. Step 3: Cross multiply
   1,349.30x = 1,862.17 × 789.74
4. Step 4: Simplify right side
   1,349.30x = 1,470,625.83
5. Step 5: Solve for x
   x = 1,470,625.83/1,349.30
6. Step 6: Final answer
   x = 1,089.92