Finding the Fourth Proportional to 1,393.73, 1,923.38 and 764.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.73 : 1,923.38 = 764.28 : x
2. Step 2: Convert to fraction form
   1,393.73/1,923.38 = 764.28/x
3. Step 3: Cross multiply
   1,393.73x = 1,923.38 × 764.28
4. Step 4: Simplify right side
   1,393.73x = 1,469,997.05
5. Step 5: Solve for x
   x = 1,469,997.05/1,393.73
6. Step 6: Final answer
   x = 1,054.73