Finding the Fourth Proportional to 1,031.18, 1,423.60 and 712.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,031.18 : 1,423.60 = 712.58 : x
2. Step 2: Convert to fraction form
   1,031.18/1,423.60 = 712.58/x
3. Step 3: Cross multiply
   1,031.18x = 1,423.60 × 712.58
4. Step 4: Simplify right side
   1,031.18x = 1,014,428.89
5. Step 5: Solve for x
   x = 1,014,428.89/1,031.18
6. Step 6: Final answer
   x = 983.76