Finding the Fourth Proportional to 2,103.07, 3,155.12 and 642.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.07 : 3,155.12 = 642.23 : x
2. Step 2: Convert to fraction form
   2,103.07/3,155.12 = 642.23/x
3. Step 3: Cross multiply
   2,103.07x = 3,155.12 × 642.23
4. Step 4: Simplify right side
   2,103.07x = 2,026,312.72
5. Step 5: Solve for x
   x = 2,026,312.72/2,103.07
6. Step 6: Final answer
   x = 963.50