Finding the Fourth Proportional to 1,640.79, 2,273.58 and 1,620.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,640.79 : 2,273.58 = 1,620.72 : x
2. Step 2: Convert to fraction form
   1,640.79/2,273.58 = 1,620.72/x
3. Step 3: Cross multiply
   1,640.79x = 2,273.58 × 1,620.72
4. Step 4: Simplify right side
   1,640.79x = 3,684,836.58
5. Step 5: Solve for x
   x = 3,684,836.58/1,640.79
6. Step 6: Final answer
   x = 2,245.77