Finding the Fourth Proportional to 1,601.83, 2,398.40 and 830.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,601.83 : 2,398.40 = 830.71 : x
2. Step 2: Convert to fraction form
   1,601.83/2,398.40 = 830.71/x
3. Step 3: Cross multiply
   1,601.83x = 2,398.40 × 830.71
4. Step 4: Simplify right side
   1,601.83x = 1,992,358.72
5. Step 5: Solve for x
   x = 1,992,358.72/1,601.83
6. Step 6: Final answer
   x = 1,243.81