Finding the Fourth Proportional to 1,361.47, 1,878.76 and 772.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,361.47 : 1,878.76 = 772.06 : x
2. Step 2: Convert to fraction form
   1,361.47/1,878.76 = 772.06/x
3. Step 3: Cross multiply
   1,361.47x = 1,878.76 × 772.06
4. Step 4: Simplify right side
   1,361.47x = 1,450,515.45
5. Step 5: Solve for x
   x = 1,450,515.45/1,361.47
6. Step 6: Final answer
   x = 1,065.40