Finding the Fourth Proportional to 1,361.57, 1,878.31 and 836.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,361.57 : 1,878.31 = 836.69 : x
2. Step 2: Convert to fraction form
   1,361.57/1,878.31 = 836.69/x
3. Step 3: Cross multiply
   1,361.57x = 1,878.31 × 836.69
4. Step 4: Simplify right side
   1,361.57x = 1,571,565.80
5. Step 5: Solve for x
   x = 1,571,565.80/1,361.57
6. Step 6: Final answer
   x = 1,154.23