Finding the Fourth Proportional to 1,103.88, 1,654.92 and 641.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,103.88 : 1,654.92 = 641.64 : x
2. Step 2: Convert to fraction form
   1,103.88/1,654.92 = 641.64/x
3. Step 3: Cross multiply
   1,103.88x = 1,654.92 × 641.64
4. Step 4: Simplify right side
   1,103.88x = 1,061,862.87
5. Step 5: Solve for x
   x = 1,061,862.87/1,103.88
6. Step 6: Final answer
   x = 961.94