Finding the Fourth Proportional to 1,031.68, 1,423.72 and 612.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,031.68 : 1,423.72 = 612.24 : x
2. Step 2: Convert to fraction form
   1,031.68/1,423.72 = 612.24/x
3. Step 3: Cross multiply
   1,031.68x = 1,423.72 × 612.24
4. Step 4: Simplify right side
   1,031.68x = 871,658.33
5. Step 5: Solve for x
   x = 871,658.33/1,031.68
6. Step 6: Final answer
   x = 844.89