Finding the Fourth Proportional to 1,393.85, 1,923.41 and 764.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.85 : 1,923.41 = 764.35 : x
2. Step 2: Convert to fraction form
   1,393.85/1,923.41 = 764.35/x
3. Step 3: Cross multiply
   1,393.85x = 1,923.41 × 764.35
4. Step 4: Simplify right side
   1,393.85x = 1,470,155.54
5. Step 5: Solve for x
   x = 1,470,155.54/1,393.85
6. Step 6: Final answer
   x = 1,054.74