Finding the Fourth Proportional to 1,392.83, 1,923.54 and 1,205.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.83 : 1,923.54 = 1,205.42 : x
2. Step 2: Convert to fraction form
   1,392.83/1,923.54 = 1,205.42/x
3. Step 3: Cross multiply
   1,392.83x = 1,923.54 × 1,205.42
4. Step 4: Simplify right side
   1,392.83x = 2,318,673.59
5. Step 5: Solve for x
   x = 2,318,673.59/1,392.83
6. Step 6: Final answer
   x = 1,664.72