Finding the Fourth Proportional to 1,398.03, 1,928.43 and 830.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.03 : 1,928.43 = 830.48 : x
2. Step 2: Convert to fraction form
   1,398.03/1,928.43 = 830.48/x
3. Step 3: Cross multiply
   1,398.03x = 1,928.43 × 830.48
4. Step 4: Simplify right side
   1,398.03x = 1,601,522.55
5. Step 5: Solve for x
   x = 1,601,522.55/1,398.03
6. Step 6: Final answer
   x = 1,145.56