Finding the Fourth Proportional to 3,665.16, 5,057.64 and 2,172.96

Step by Step Solution

1. Step 1: Write the proportion equation
   3,665.16 : 5,057.64 = 2,172.96 : x
2. Step 2: Convert to fraction form
   3,665.16/5,057.64 = 2,172.96/x
3. Step 3: Cross multiply
   3,665.16x = 5,057.64 × 2,172.96
4. Step 4: Simplify right side
   3,665.16x = 10,990,049.41
5. Step 5: Solve for x
   x = 10,990,049.41/3,665.16
6. Step 6: Final answer
   x = 2,998.52