Finding the Fourth Proportional to 1,040.69, 1,435.18 and 775.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,040.69 : 1,435.18 = 775.72 : x
2. Step 2: Convert to fraction form
   1,040.69/1,435.18 = 775.72/x
3. Step 3: Cross multiply
   1,040.69x = 1,435.18 × 775.72
4. Step 4: Simplify right side
   1,040.69x = 1,113,297.68
5. Step 5: Solve for x
   x = 1,113,297.68/1,040.69
6. Step 6: Final answer
   x = 1,069.77