Finding the Fourth Proportional to 1,076.50, 1,613.94 and 427.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,076.50 : 1,613.94 = 427.42 : x
2. Step 2: Convert to fraction form
   1,076.50/1,613.94 = 427.42/x
3. Step 3: Cross multiply
   1,076.50x = 1,613.94 × 427.42
4. Step 4: Simplify right side
   1,076.50x = 689,830.23
5. Step 5: Solve for x
   x = 689,830.23/1,076.50
6. Step 6: Final answer
   x = 640.81