Finding the Fourth Proportional to 1,361.53, 1,878.69 and 772.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,361.53 : 1,878.69 = 772.03 : x
2. Step 2: Convert to fraction form
   1,361.53/1,878.69 = 772.03/x
3. Step 3: Cross multiply
   1,361.53x = 1,878.69 × 772.03
4. Step 4: Simplify right side
   1,361.53x = 1,450,405.04
5. Step 5: Solve for x
   x = 1,450,405.04/1,361.53
6. Step 6: Final answer
   x = 1,065.28