Finding the Fourth Proportional to 1,103.67, 1,653.21 and 663.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,103.67 : 1,653.21 = 663.53 : x
2. Step 2: Convert to fraction form
   1,103.67/1,653.21 = 663.53/x
3. Step 3: Cross multiply
   1,103.67x = 1,653.21 × 663.53
4. Step 4: Simplify right side
   1,103.67x = 1,096,946.17
5. Step 5: Solve for x
   x = 1,096,946.17/1,103.67
6. Step 6: Final answer
   x = 993.91