Finding the Fourth Proportional to 1,339.69, 1,848.64 and 779.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,339.69 : 1,848.64 = 779.98 : x
2. Step 2: Convert to fraction form
   1,339.69/1,848.64 = 779.98/x
3. Step 3: Cross multiply
   1,339.69x = 1,848.64 × 779.98
4. Step 4: Simplify right side
   1,339.69x = 1,441,902.23
5. Step 5: Solve for x
   x = 1,441,902.23/1,339.69
6. Step 6: Final answer
   x = 1,076.30