Finding the Fourth Proportional to 2,103.37, 3,155.15 and 642.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.37 : 3,155.15 = 642.53 : x
2. Step 2: Convert to fraction form
   2,103.37/3,155.15 = 642.53/x
3. Step 3: Cross multiply
   2,103.37x = 3,155.15 × 642.53
4. Step 4: Simplify right side
   2,103.37x = 2,027,288.02
5. Step 5: Solve for x
   x = 2,027,288.02/2,103.37
6. Step 6: Final answer
   x = 963.83