Finding the Fourth Proportional to 3,665.71, 5,057.10 and 2,172.83

Step by Step Solution

1. Step 1: Write the proportion equation
   3,665.71 : 5,057.10 = 2,172.83 : x
2. Step 2: Convert to fraction form
   3,665.71/5,057.10 = 2,172.83/x
3. Step 3: Cross multiply
   3,665.71x = 5,057.10 × 2,172.83
4. Step 4: Simplify right side
   3,665.71x = 10,988,193.31
5. Step 5: Solve for x
   x = 10,988,193.31/3,665.71
6. Step 6: Final answer
   x = 2,997.56