Finding the Fourth Proportional to 1,392.23, 1,920.67 and 919.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.23 : 1,920.67 = 919.52 : x
2. Step 2: Convert to fraction form
   1,392.23/1,920.67 = 919.52/x
3. Step 3: Cross multiply
   1,392.23x = 1,920.67 × 919.52
4. Step 4: Simplify right side
   1,392.23x = 1,766,094.48
5. Step 5: Solve for x
   x = 1,766,094.48/1,392.23
6. Step 6: Final answer
   x = 1,268.54