Finding the Fourth Proportional to 3,680.48, 5,079.20 and 2,087.21

Step by Step Solution

1. Step 1: Write the proportion equation
   3,680.48 : 5,079.20 = 2,087.21 : x
2. Step 2: Convert to fraction form
   3,680.48/5,079.20 = 2,087.21/x
3. Step 3: Cross multiply
   3,680.48x = 5,079.20 × 2,087.21
4. Step 4: Simplify right side
   3,680.48x = 10,601,321.20
5. Step 5: Solve for x
   x = 10,601,321.20/3,680.48
6. Step 6: Final answer
   x = 2,880.42