Finding the Fourth Proportional to 2,640.72, 3,644.28 and 1,812.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.72 : 3,644.28 = 1,812.72 : x
2. Step 2: Convert to fraction form
   2,640.72/3,644.28 = 1,812.72/x
3. Step 3: Cross multiply
   2,640.72x = 3,644.28 × 1,812.72
4. Step 4: Simplify right side
   2,640.72x = 6,606,059.24
5. Step 5: Solve for x
   x = 6,606,059.24/2,640.72
6. Step 6: Final answer
   x = 2,501.61