Finding the Fourth Proportional to 1,096.40, 1,641.72 and 1,031.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,096.40 : 1,641.72 = 1,031.60 : x
2. Step 2: Convert to fraction form
   1,096.40/1,641.72 = 1,031.60/x
3. Step 3: Cross multiply
   1,096.40x = 1,641.72 × 1,031.60
4. Step 4: Simplify right side
   1,096.40x = 1,693,598.35
5. Step 5: Solve for x
   x = 1,693,598.35/1,096.40
6. Step 6: Final answer
   x = 1,544.69