Finding the Fourth Proportional to 1,031.82, 1,423.84 and 612.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,031.82 : 1,423.84 = 612.15 : x
2. Step 2: Convert to fraction form
   1,031.82/1,423.84 = 612.15/x
3. Step 3: Cross multiply
   1,031.82x = 1,423.84 × 612.15
4. Step 4: Simplify right side
   1,031.82x = 871,603.66
5. Step 5: Solve for x
   x = 871,603.66/1,031.82
6. Step 6: Final answer
   x = 844.72