Finding the Fourth Proportional to 1,040.34, 1,436.76 and 774.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,040.34 : 1,436.76 = 774.40 : x
2. Step 2: Convert to fraction form
   1,040.34/1,436.76 = 774.40/x
3. Step 3: Cross multiply
   1,040.34x = 1,436.76 × 774.40
4. Step 4: Simplify right side
   1,040.34x = 1,112,626.94
5. Step 5: Solve for x
   x = 1,112,626.94/1,040.34
6. Step 6: Final answer
   x = 1,069.48