Finding the Fourth Proportional to 1,096.38, 1,642.68 and 663.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,096.38 : 1,642.68 = 663.30 : x
2. Step 2: Convert to fraction form
   1,096.38/1,642.68 = 663.30/x
3. Step 3: Cross multiply
   1,096.38x = 1,642.68 × 663.30
4. Step 4: Simplify right side
   1,096.38x = 1,089,589.64
5. Step 5: Solve for x
   x = 1,089,589.64/1,096.38
6. Step 6: Final answer
   x = 993.81