Finding the Fourth Proportional to 1,076.41, 1,613.60 and 664.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,076.41 : 1,613.60 = 664.30 : x
2. Step 2: Convert to fraction form
   1,076.41/1,613.60 = 664.30/x
3. Step 3: Cross multiply
   1,076.41x = 1,613.60 × 664.30
4. Step 4: Simplify right side
   1,076.41x = 1,071,913.80
5. Step 5: Solve for x
   x = 1,071,913.80/1,076.41
6. Step 6: Final answer
   x = 995.82