Finding the Fourth Proportional to 1,361.68, 1,878.96 and 772.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,361.68 : 1,878.96 = 772.09 : x
2. Step 2: Convert to fraction form
   1,361.68/1,878.96 = 772.09/x
3. Step 3: Cross multiply
   1,361.68x = 1,878.96 × 772.09
4. Step 4: Simplify right side
   1,361.68x = 1,450,726.23
5. Step 5: Solve for x
   x = 1,450,726.23/1,361.68
6. Step 6: Final answer
   x = 1,065.39