Finding the Fourth Proportional to 1,031.98, 1,423.90 and 612.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,031.98 : 1,423.90 = 612.46 : x
2. Step 2: Convert to fraction form
   1,031.98/1,423.90 = 612.46/x
3. Step 3: Cross multiply
   1,031.98x = 1,423.90 × 612.46
4. Step 4: Simplify right side
   1,031.98x = 872,081.79
5. Step 5: Solve for x
   x = 872,081.79/1,031.98
6. Step 6: Final answer
   x = 845.06