Finding the Fourth Proportional to 2,631.47, 3,945.88 and 875.85

Step by Step Solution

1. Step 1: Write the proportion equation
   2,631.47 : 3,945.88 = 875.85 : x
2. Step 2: Convert to fraction form
   2,631.47/3,945.88 = 875.85/x
3. Step 3: Cross multiply
   2,631.47x = 3,945.88 × 875.85
4. Step 4: Simplify right side
   2,631.47x = 3,456,007.49
5. Step 5: Solve for x
   x = 3,456,007.49/2,631.47
6. Step 6: Final answer
   x = 1,313.34