Finding the Fourth Proportional to 2,103.09, 3,155.00 and 641.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.09 : 3,155.00 = 641.91 : x
2. Step 2: Convert to fraction form
   2,103.09/3,155.00 = 641.91/x
3. Step 3: Cross multiply
   2,103.09x = 3,155.00 × 641.91
4. Step 4: Simplify right side
   2,103.09x = 2,025,222.84
5. Step 5: Solve for x
   x = 2,025,222.84/2,103.09
6. Step 6: Final answer
   x = 962.97