Finding the Fourth Proportional to 1,393.94, 1,923.64 and 764.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.94 : 1,923.64 = 764.45 : x
2. Step 2: Convert to fraction form
   1,393.94/1,923.64 = 764.45/x
3. Step 3: Cross multiply
   1,393.94x = 1,923.64 × 764.45
4. Step 4: Simplify right side
   1,393.94x = 1,470,524.69
5. Step 5: Solve for x
   x = 1,470,524.69/1,393.94
6. Step 6: Final answer
   x = 1,054.94