Finding the Fourth Proportional to 1,361.55, 1,878.83 and 772.14

Step by Step Solution

1. Step 1: Write the proportion equation
   1,361.55 : 1,878.83 = 772.14 : x
2. Step 2: Convert to fraction form
   1,361.55/1,878.83 = 772.14/x
3. Step 3: Cross multiply
   1,361.55x = 1,878.83 × 772.14
4. Step 4: Simplify right side
   1,361.55x = 1,450,730.22
5. Step 5: Solve for x
   x = 1,450,730.22/1,361.55
6. Step 6: Final answer
   x = 1,065.50