Finding the Fourth Proportional to 1,379.30, 1,902.88 and 789.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.30 : 1,902.88 = 789.52 : x
2. Step 2: Convert to fraction form
   1,379.30/1,902.88 = 789.52/x
3. Step 3: Cross multiply
   1,379.30x = 1,902.88 × 789.52
4. Step 4: Simplify right side
   1,379.30x = 1,502,361.82
5. Step 5: Solve for x
   x = 1,502,361.82/1,379.30
6. Step 6: Final answer
   x = 1,089.22