Finding the Fourth Proportional to 1,103.39, 1,652.55 and 640.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,103.39 : 1,652.55 = 640.02 : x
2. Step 2: Convert to fraction form
   1,103.39/1,652.55 = 640.02/x
3. Step 3: Cross multiply
   1,103.39x = 1,652.55 × 640.02
4. Step 4: Simplify right side
   1,103.39x = 1,057,665.05
5. Step 5: Solve for x
   x = 1,057,665.05/1,103.39
6. Step 6: Final answer
   x = 958.56