Finding the Fourth Proportional to 1,392.89, 1,923.89 and 1,019.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.89 : 1,923.89 = 1,019.34 : x
2. Step 2: Convert to fraction form
   1,392.89/1,923.89 = 1,019.34/x
3. Step 3: Cross multiply
   1,392.89x = 1,923.89 × 1,019.34
4. Step 4: Simplify right side
   1,392.89x = 1,961,092.94
5. Step 5: Solve for x
   x = 1,961,092.94/1,392.89
6. Step 6: Final answer
   x = 1,407.94