Finding the Fourth Proportional to 1,399.03, 1,930.76 and 839.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.03 : 1,930.76 = 839.48 : x
2. Step 2: Convert to fraction form
   1,399.03/1,930.76 = 839.48/x
3. Step 3: Cross multiply
   1,399.03x = 1,930.76 × 839.48
4. Step 4: Simplify right side
   1,399.03x = 1,620,830.21
5. Step 5: Solve for x
   x = 1,620,830.21/1,399.03
6. Step 6: Final answer
   x = 1,158.54