Finding the Fourth Proportional to 1,397.83, 1,928.28 and 838.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.83 : 1,928.28 = 838.03 : x
2. Step 2: Convert to fraction form
   1,397.83/1,928.28 = 838.03/x
3. Step 3: Cross multiply
   1,397.83x = 1,928.28 × 838.03
4. Step 4: Simplify right side
   1,397.83x = 1,615,956.49
5. Step 5: Solve for x
   x = 1,615,956.49/1,397.83
6. Step 6: Final answer
   x = 1,156.05