Finding the Fourth Proportional to 3,131.91, 4,321.75 and 1,872.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,131.91 : 4,321.75 = 1,872.72 : x
2. Step 2: Convert to fraction form
   3,131.91/4,321.75 = 1,872.72/x
3. Step 3: Cross multiply
   3,131.91x = 4,321.75 × 1,872.72
4. Step 4: Simplify right side
   3,131.91x = 8,093,427.66
5. Step 5: Solve for x
   x = 8,093,427.66/3,131.91
6. Step 6: Final answer
   x = 2,584.18