Finding the Fourth Proportional to 1,393.97, 1,923.73 and 764.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.97 : 1,923.73 = 764.56 : x
2. Step 2: Convert to fraction form
   1,393.97/1,923.73 = 764.56/x
3. Step 3: Cross multiply
   1,393.97x = 1,923.73 × 764.56
4. Step 4: Simplify right side
   1,393.97x = 1,470,800.98
5. Step 5: Solve for x
   x = 1,470,800.98/1,393.97
6. Step 6: Final answer
   x = 1,055.12