Finding the Fourth Proportional to 1,379.69, 1,903.78 and 982.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.69 : 1,903.78 = 982.39 : x
2. Step 2: Convert to fraction form
   1,379.69/1,903.78 = 982.39/x
3. Step 3: Cross multiply
   1,379.69x = 1,903.78 × 982.39
4. Step 4: Simplify right side
   1,379.69x = 1,870,247.22
5. Step 5: Solve for x
   x = 1,870,247.22/1,379.69
6. Step 6: Final answer
   x = 1,355.55