Finding the Fourth Proportional to 1,031.57, 1,423.46 and 611.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,031.57 : 1,423.46 = 611.78 : x
2. Step 2: Convert to fraction form
   1,031.57/1,423.46 = 611.78/x
3. Step 3: Cross multiply
   1,031.57x = 1,423.46 × 611.78
4. Step 4: Simplify right side
   1,031.57x = 870,835.33
5. Step 5: Solve for x
   x = 870,835.33/1,031.57
6. Step 6: Final answer
   x = 844.18