Finding the Fourth Proportional to 1,393.83, 1,922.78 and 979.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.83 : 1,922.78 = 979.11 : x
2. Step 2: Convert to fraction form
   1,393.83/1,922.78 = 979.11/x
3. Step 3: Cross multiply
   1,393.83x = 1,922.78 × 979.11
4. Step 4: Simplify right side
   1,393.83x = 1,882,608.23
5. Step 5: Solve for x
   x = 1,882,608.23/1,393.83
6. Step 6: Final answer
   x = 1,350.67