Finding the Fourth Proportional to 1,361.28, 1,878.57 and 772.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,361.28 : 1,878.57 = 772.01 : x
2. Step 2: Convert to fraction form
   1,361.28/1,878.57 = 772.01/x
3. Step 3: Cross multiply
   1,361.28x = 1,878.57 × 772.01
4. Step 4: Simplify right side
   1,361.28x = 1,450,274.83
5. Step 5: Solve for x
   x = 1,450,274.83/1,361.28
6. Step 6: Final answer
   x = 1,065.38