Finding the Fourth Proportional to 1,393.79, 1,923.42 and 764.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.79 : 1,923.42 = 764.30 : x
2. Step 2: Convert to fraction form
   1,393.79/1,923.42 = 764.30/x
3. Step 3: Cross multiply
   1,393.79x = 1,923.42 × 764.30
4. Step 4: Simplify right side
   1,393.79x = 1,470,069.91
5. Step 5: Solve for x
   x = 1,470,069.91/1,393.79
6. Step 6: Final answer
   x = 1,054.73