Finding the Fourth Proportional to 3,664.72, 5,057.70 and 2,173.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,664.72 : 5,057.70 = 2,173.12 : x
2. Step 2: Convert to fraction form
   3,664.72/5,057.70 = 2,173.12/x
3. Step 3: Cross multiply
   3,664.72x = 5,057.70 × 2,173.12
4. Step 4: Simplify right side
   3,664.72x = 10,990,989.02
5. Step 5: Solve for x
   x = 10,990,989.02/3,664.72
6. Step 6: Final answer
   x = 2,999.13