Finding the Fourth Proportional to 2,105.51, 3,157.52 and 872.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.51 : 3,157.52 = 872.37 : x
2. Step 2: Convert to fraction form
   2,105.51/3,157.52 = 872.37/x
3. Step 3: Cross multiply
   2,105.51x = 3,157.52 × 872.37
4. Step 4: Simplify right side
   2,105.51x = 2,754,521.36
5. Step 5: Solve for x
   x = 2,754,521.36/2,105.51
6. Step 6: Final answer
   x = 1,308.25