Finding the Fourth Proportional to 1,339.30, 1,848.18 and 779.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,339.30 : 1,848.18 = 779.79 : x
2. Step 2: Convert to fraction form
   1,339.30/1,848.18 = 779.79/x
3. Step 3: Cross multiply
   1,339.30x = 1,848.18 × 779.79
4. Step 4: Simplify right side
   1,339.30x = 1,441,183.04
5. Step 5: Solve for x
   x = 1,441,183.04/1,339.30
6. Step 6: Final answer
   x = 1,076.07