Finding the Fourth Proportional to 1,276.74, 1,761.89 and 779.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,276.74 : 1,761.89 = 779.29 : x
2. Step 2: Convert to fraction form
   1,276.74/1,761.89 = 779.29/x
3. Step 3: Cross multiply
   1,276.74x = 1,761.89 × 779.29
4. Step 4: Simplify right side
   1,276.74x = 1,373,014.96
5. Step 5: Solve for x
   x = 1,373,014.96/1,276.74
6. Step 6: Final answer
   x = 1,075.41