Finding the Fourth Proportional to 1,361.97, 1,879.61 and 772.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,361.97 : 1,879.61 = 772.29 : x
2. Step 2: Convert to fraction form
   1,361.97/1,879.61 = 772.29/x
3. Step 3: Cross multiply
   1,361.97x = 1,879.61 × 772.29
4. Step 4: Simplify right side
   1,361.97x = 1,451,600.15
5. Step 5: Solve for x
   x = 1,451,600.15/1,361.97
6. Step 6: Final answer
   x = 1,065.81