Finding the Fourth Proportional to 1,393.90, 1,923.78 and 945.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.90 : 1,923.78 = 945.79 : x
2. Step 2: Convert to fraction form
   1,393.90/1,923.78 = 945.79/x
3. Step 3: Cross multiply
   1,393.90x = 1,923.78 × 945.79
4. Step 4: Simplify right side
   1,393.90x = 1,819,491.89
5. Step 5: Solve for x
   x = 1,819,491.89/1,393.90
6. Step 6: Final answer
   x = 1,305.32