Finding the Fourth Proportional to 1,369.29, 1,889.07 and 779.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,369.29 : 1,889.07 = 779.72 : x
2. Step 2: Convert to fraction form
   1,369.29/1,889.07 = 779.72/x
3. Step 3: Cross multiply
   1,369.29x = 1,889.07 × 779.72
4. Step 4: Simplify right side
   1,369.29x = 1,472,936.22
5. Step 5: Solve for x
   x = 1,472,936.22/1,369.29
6. Step 6: Final answer
   x = 1,075.69