Finding the Fourth Proportional to 3,976.76, 5,487.82 and 2,275.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,976.76 : 5,487.82 = 2,275.31 : x
2. Step 2: Convert to fraction form
   3,976.76/5,487.82 = 2,275.31/x
3. Step 3: Cross multiply
   3,976.76x = 5,487.82 × 2,275.31
4. Step 4: Simplify right side
   3,976.76x = 12,486,499.76
5. Step 5: Solve for x
   x = 12,486,499.76/3,976.76
6. Step 6: Final answer
   x = 3,139.87