Finding the Fourth Proportional to 1,361.47, 1,878.90 and 772.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,361.47 : 1,878.90 = 772.09 : x
2. Step 2: Convert to fraction form
   1,361.47/1,878.90 = 772.09/x
3. Step 3: Cross multiply
   1,361.47x = 1,878.90 × 772.09
4. Step 4: Simplify right side
   1,361.47x = 1,450,679.90
5. Step 5: Solve for x
   x = 1,450,679.90/1,361.47
6. Step 6: Final answer
   x = 1,065.52