Finding the Fourth Proportional to 1,361.78, 1,878.50 and 837.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,361.78 : 1,878.50 = 837.71 : x
2. Step 2: Convert to fraction form
   1,361.78/1,878.50 = 837.71/x
3. Step 3: Cross multiply
   1,361.78x = 1,878.50 × 837.71
4. Step 4: Simplify right side
   1,361.78x = 1,573,634.05
5. Step 5: Solve for x
   x = 1,573,634.05/1,361.78
6. Step 6: Final answer
   x = 1,155.57