Finding the Fourth Proportional to 2,631.29, 3,947.31 and 875.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,631.29 : 3,947.31 = 875.72 : x
2. Step 2: Convert to fraction form
   2,631.29/3,947.31 = 875.72/x
3. Step 3: Cross multiply
   2,631.29x = 3,947.31 × 875.72
4. Step 4: Simplify right side
   2,631.29x = 3,456,738.31
5. Step 5: Solve for x
   x = 3,456,738.31/2,631.29
6. Step 6: Final answer
   x = 1,313.70