Finding the Fourth Proportional to 1,339.91, 1,848.63 and 779.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,339.91 : 1,848.63 = 779.93 : x
2. Step 2: Convert to fraction form
   1,339.91/1,848.63 = 779.93/x
3. Step 3: Cross multiply
   1,339.91x = 1,848.63 × 779.93
4. Step 4: Simplify right side
   1,339.91x = 1,441,809.54
5. Step 5: Solve for x
   x = 1,441,809.54/1,339.91
6. Step 6: Final answer
   x = 1,076.05