Finding the Fourth Proportional to 2,631.79, 3,947.89 and 876.73

Step by Step Solution

1. Step 1: Write the proportion equation
   2,631.79 : 3,947.89 = 876.73 : x
2. Step 2: Convert to fraction form
   2,631.79/3,947.89 = 876.73/x
3. Step 3: Cross multiply
   2,631.79x = 3,947.89 × 876.73
4. Step 4: Simplify right side
   2,631.79x = 3,461,213.86
5. Step 5: Solve for x
   x = 3,461,213.86/2,631.79
6. Step 6: Final answer
   x = 1,315.16