Finding the Fourth Proportional to 1,339.47, 1,848.62 and 779.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,339.47 : 1,848.62 = 779.96 : x
2. Step 2: Convert to fraction form
   1,339.47/1,848.62 = 779.96/x
3. Step 3: Cross multiply
   1,339.47x = 1,848.62 × 779.96
4. Step 4: Simplify right side
   1,339.47x = 1,441,849.66
5. Step 5: Solve for x
   x = 1,441,849.66/1,339.47
6. Step 6: Final answer
   x = 1,076.43