Finding the Fourth Proportional to 1,398.34, 1,928.85 and 874.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.34 : 1,928.85 = 874.27 : x
2. Step 2: Convert to fraction form
   1,398.34/1,928.85 = 874.27/x
3. Step 3: Cross multiply
   1,398.34x = 1,928.85 × 874.27
4. Step 4: Simplify right side
   1,398.34x = 1,686,335.69
5. Step 5: Solve for x
   x = 1,686,335.69/1,398.34
6. Step 6: Final answer
   x = 1,205.96