Finding the Fourth Proportional to 1,103.20, 1,656.01 and 641.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,103.20 : 1,656.01 = 641.50 : x
2. Step 2: Convert to fraction form
   1,103.20/1,656.01 = 641.50/x
3. Step 3: Cross multiply
   1,103.20x = 1,656.01 × 641.50
4. Step 4: Simplify right side
   1,103.20x = 1,062,330.42
5. Step 5: Solve for x
   x = 1,062,330.42/1,103.20
6. Step 6: Final answer
   x = 962.95