Finding the Fourth Proportional to 1,230.83, 1,698.51 and 671.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,230.83 : 1,698.51 = 671.31 : x
2. Step 2: Convert to fraction form
   1,230.83/1,698.51 = 671.31/x
3. Step 3: Cross multiply
   1,230.83x = 1,698.51 × 671.31
4. Step 4: Simplify right side
   1,230.83x = 1,140,229.27
5. Step 5: Solve for x
   x = 1,140,229.27/1,230.83
6. Step 6: Final answer
   x = 926.39