Finding the Fourth Proportional to 1,361.29, 1,878.51 and 771.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,361.29 : 1,878.51 = 771.83 : x
2. Step 2: Convert to fraction form
   1,361.29/1,878.51 = 771.83/x
3. Step 3: Cross multiply
   1,361.29x = 1,878.51 × 771.83
4. Step 4: Simplify right side
   1,361.29x = 1,449,895.07
5. Step 5: Solve for x
   x = 1,449,895.07/1,361.29
6. Step 6: Final answer
   x = 1,065.09