Finding the Fourth Proportional to 1,240.56, 1,710.72 and 774

Step by Step Solution

1. Step 1: Write the proportion equation
   1,240.56 : 1,710.72 = 774 : x
2. Step 2: Convert to fraction form
   1,240.56/1,710.72 = 774/x
3. Step 3: Cross multiply
   1,240.56x = 1,710.72 × 774
4. Step 4: Simplify right side
   1,240.56x = 1,324,097.28
5. Step 5: Solve for x
   x = 1,324,097.28/1,240.56
6. Step 6: Final answer
   x = 1,067.34