Finding the Fourth Proportional to 1,361.72, 1,879.11 and 772.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,361.72 : 1,879.11 = 772.29 : x
2. Step 2: Convert to fraction form
   1,361.72/1,879.11 = 772.29/x
3. Step 3: Cross multiply
   1,361.72x = 1,879.11 × 772.29
4. Step 4: Simplify right side
   1,361.72x = 1,451,217.86
5. Step 5: Solve for x
   x = 1,451,217.86/1,361.72
6. Step 6: Final answer
   x = 1,065.73