Finding the Fourth Proportional to 1,394.40, 1,923.60 and 834.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,394.40 : 1,923.60 = 834.72 : x
2. Step 2: Convert to fraction form
   1,394.40/1,923.60 = 834.72/x
3. Step 3: Cross multiply
   1,394.40x = 1,923.60 × 834.72
4. Step 4: Simplify right side
   1,394.40x = 1,605,667.39
5. Step 5: Solve for x
   x = 1,605,667.39/1,394.40
6. Step 6: Final answer
   x = 1,151.51