Finding the Fourth Proportional to 2,880.31, 3,951.47 and 2,740.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,880.31 : 3,951.47 = 2,740.87 : x
2. Step 2: Convert to fraction form
   2,880.31/3,951.47 = 2,740.87/x
3. Step 3: Cross multiply
   2,880.31x = 3,951.47 × 2,740.87
4. Step 4: Simplify right side
   2,880.31x = 10,830,465.58
5. Step 5: Solve for x
   x = 10,830,465.58/2,880.31
6. Step 6: Final answer
   x = 3,760.17