Finding the Fourth Proportional to 1,031.55, 1,423.71 and 611.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,031.55 : 1,423.71 = 611.88 : x
2. Step 2: Convert to fraction form
   1,031.55/1,423.71 = 611.88/x
3. Step 3: Cross multiply
   1,031.55x = 1,423.71 × 611.88
4. Step 4: Simplify right side
   1,031.55x = 871,139.67
5. Step 5: Solve for x
   x = 871,139.67/1,031.55
6. Step 6: Final answer
   x = 844.50