Finding the Fourth Proportional to 1,640.55, 2,458.89 and 1,622.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,640.55 : 2,458.89 = 1,622.28 : x
2. Step 2: Convert to fraction form
   1,640.55/2,458.89 = 1,622.28/x
3. Step 3: Cross multiply
   1,640.55x = 2,458.89 × 1,622.28
4. Step 4: Simplify right side
   1,640.55x = 3,989,008.07
5. Step 5: Solve for x
   x = 3,989,008.07/1,640.55
6. Step 6: Final answer
   x = 2,431.51