Finding the Fourth Proportional to 2,104.35, 3,153.83 and 872.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,104.35 : 3,153.83 = 872.61 : x
2. Step 2: Convert to fraction form
   2,104.35/3,153.83 = 872.61/x
3. Step 3: Cross multiply
   2,104.35x = 3,153.83 × 872.61
4. Step 4: Simplify right side
   2,104.35x = 2,752,059.23
5. Step 5: Solve for x
   x = 2,752,059.23/2,104.35
6. Step 6: Final answer
   x = 1,307.80