Finding the Fourth Proportional to 1,103.48, 1,654.70 and 641.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,103.48 : 1,654.70 = 641.39 : x
2. Step 2: Convert to fraction form
   1,103.48/1,654.70 = 641.39/x
3. Step 3: Cross multiply
   1,103.48x = 1,654.70 × 641.39
4. Step 4: Simplify right side
   1,103.48x = 1,061,301.36
5. Step 5: Solve for x
   x = 1,061,301.36/1,103.48
6. Step 6: Final answer
   x = 961.78