Finding the Fourth Proportional to 1,394.58, 1,923.81 and 979.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,394.58 : 1,923.81 = 979.86 : x
2. Step 2: Convert to fraction form
   1,394.58/1,923.81 = 979.86/x
3. Step 3: Cross multiply
   1,394.58x = 1,923.81 × 979.86
4. Step 4: Simplify right side
   1,394.58x = 1,885,064.47
5. Step 5: Solve for x
   x = 1,885,064.47/1,394.58
6. Step 6: Final answer
   x = 1,351.71