Finding the Fourth Proportional to 801.57, 1,105.98 and 486.83

Step by Step Solution

1. Step 1: Write the proportion equation
   801.57 : 1,105.98 = 486.83 : x
2. Step 2: Convert to fraction form
   801.57/1,105.98 = 486.83/x
3. Step 3: Cross multiply
   801.57x = 1,105.98 × 486.83
4. Step 4: Simplify right side
   801.57x = 538,422.86
5. Step 5: Solve for x
   x = 538,422.86/801.57
6. Step 6: Final answer
   x = 671.71