Finding the Fourth Proportional to 1,399.14, 1,930.86 and 1,007.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.14 : 1,930.86 = 1,007.82 : x
2. Step 2: Convert to fraction form
   1,399.14/1,930.86 = 1,007.82/x
3. Step 3: Cross multiply
   1,399.14x = 1,930.86 × 1,007.82
4. Step 4: Simplify right side
   1,399.14x = 1,945,959.33
5. Step 5: Solve for x
   x = 1,945,959.33/1,399.14
6. Step 6: Final answer
   x = 1,390.83