Finding the Fourth Proportional to 1,393.92, 1,923.62 and 764.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.92 : 1,923.62 = 764.42 : x
2. Step 2: Convert to fraction form
   1,393.92/1,923.62 = 764.42/x
3. Step 3: Cross multiply
   1,393.92x = 1,923.62 × 764.42
4. Step 4: Simplify right side
   1,393.92x = 1,470,453.60
5. Step 5: Solve for x
   x = 1,470,453.60/1,393.92
6. Step 6: Final answer
   x = 1,054.91