Finding the Fourth Proportional to 7,280.72, 10,921.02 and 2,086.60

Step by Step Solution

1. Step 1: Write the proportion equation
   7,280.72 : 10,921.02 = 2,086.60 : x
2. Step 2: Convert to fraction form
   7,280.72/10,921.02 = 2,086.60/x
3. Step 3: Cross multiply
   7,280.72x = 10,921.02 × 2,086.60
4. Step 4: Simplify right side
   7,280.72x = 22,787,800.33
5. Step 5: Solve for x
   x = 22,787,800.33/7,280.72
6. Step 6: Final answer
   x = 3,129.88