Finding the Fourth Proportional to 1,361.58, 1,878.99 and 772.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,361.58 : 1,878.99 = 772.12 : x
2. Step 2: Convert to fraction form
   1,361.58/1,878.99 = 772.12/x
3. Step 3: Cross multiply
   1,361.58x = 1,878.99 × 772.12
4. Step 4: Simplify right side
   1,361.58x = 1,450,801.90
5. Step 5: Solve for x
   x = 1,450,801.90/1,361.58
6. Step 6: Final answer
   x = 1,065.53