Finding the Fourth Proportional to 2,103.46, 3,155.27 and 642.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.46 : 3,155.27 = 642.62 : x
2. Step 2: Convert to fraction form
   2,103.46/3,155.27 = 642.62/x
3. Step 3: Cross multiply
   2,103.46x = 3,155.27 × 642.62
4. Step 4: Simplify right side
   2,103.46x = 2,027,644.28
5. Step 5: Solve for x
   x = 2,027,644.28/2,103.46
6. Step 6: Final answer
   x = 963.96