Finding the Fourth Proportional to 1,393.91, 1,923.60 and 764.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.91 : 1,923.60 = 764.43 : x
2. Step 2: Convert to fraction form
   1,393.91/1,923.60 = 764.43/x
3. Step 3: Cross multiply
   1,393.91x = 1,923.60 × 764.43
4. Step 4: Simplify right side
   1,393.91x = 1,470,453.18
5. Step 5: Solve for x
   x = 1,470,453.18/1,393.91
6. Step 6: Final answer
   x = 1,054.92