Finding the Fourth Proportional to 1,397.94, 1,928.25 and 873.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.94 : 1,928.25 = 873.78 : x
2. Step 2: Convert to fraction form
   1,397.94/1,928.25 = 873.78/x
3. Step 3: Cross multiply
   1,397.94x = 1,928.25 × 873.78
4. Step 4: Simplify right side
   1,397.94x = 1,684,866.29
5. Step 5: Solve for x
   x = 1,684,866.29/1,397.94
6. Step 6: Final answer
   x = 1,205.25