Finding the Fourth Proportional to 1,361.33, 1,878.71 and 763.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,361.33 : 1,878.71 = 763.79 : x
2. Step 2: Convert to fraction form
   1,361.33/1,878.71 = 763.79/x
3. Step 3: Cross multiply
   1,361.33x = 1,878.71 × 763.79
4. Step 4: Simplify right side
   1,361.33x = 1,434,939.91
5. Step 5: Solve for x
   x = 1,434,939.91/1,361.33
6. Step 6: Final answer
   x = 1,054.07