Finding the Fourth Proportional to 1,399.00, 1,930.26 and 839.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.00 : 1,930.26 = 839.72 : x
2. Step 2: Convert to fraction form
   1,399.00/1,930.26 = 839.72/x
3. Step 3: Cross multiply
   1,399.00x = 1,930.26 × 839.72
4. Step 4: Simplify right side
   1,399.00x = 1,620,867.96
5. Step 5: Solve for x
   x = 1,620,867.96/1,399.00
6. Step 6: Final answer
   x = 1,158.59