Finding the Fourth Proportional to 1,103.55, 1,654.79 and 641.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,103.55 : 1,654.79 = 641.46 : x
2. Step 2: Convert to fraction form
   1,103.55/1,654.79 = 641.46/x
3. Step 3: Cross multiply
   1,103.55x = 1,654.79 × 641.46
4. Step 4: Simplify right side
   1,103.55x = 1,061,485.10
5. Step 5: Solve for x
   x = 1,061,485.10/1,103.55
6. Step 6: Final answer
   x = 961.88