Finding the Fourth Proportional to 3,680.50, 5,079.31 and 2,087.21

Step by Step Solution

1. Step 1: Write the proportion equation
   3,680.50 : 5,079.31 = 2,087.21 : x
2. Step 2: Convert to fraction form
   3,680.50/5,079.31 = 2,087.21/x
3. Step 3: Cross multiply
   3,680.50x = 5,079.31 × 2,087.21
4. Step 4: Simplify right side
   3,680.50x = 10,601,576.19
5. Step 5: Solve for x
   x = 10,601,576.19/3,680.50
6. Step 6: Final answer
   x = 2,880.48