Finding the Fourth Proportional to 1,399.03, 1,930.16 and 979.85

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.03 : 1,930.16 = 979.85 : x
2. Step 2: Convert to fraction form
   1,399.03/1,930.16 = 979.85/x
3. Step 3: Cross multiply
   1,399.03x = 1,930.16 × 979.85
4. Step 4: Simplify right side
   1,399.03x = 1,891,274.55
5. Step 5: Solve for x
   x = 1,891,274.55/1,399.03
6. Step 6: Final answer
   x = 1,351.85