Finding the Fourth Proportional to 2,105.52, 3,157.56 and 872.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.52 : 3,157.56 = 872.58 : x
2. Step 2: Convert to fraction form
   2,105.52/3,157.56 = 872.58/x
3. Step 3: Cross multiply
   2,105.52x = 3,157.56 × 872.58
4. Step 4: Simplify right side
   2,105.52x = 2,755,223.70
5. Step 5: Solve for x
   x = 2,755,223.70/2,105.52
6. Step 6: Final answer
   x = 1,308.57