Finding the Fourth Proportional to 1,620.42, 2,229.57 and 1,583.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,620.42 : 2,229.57 = 1,583.57 : x
2. Step 2: Convert to fraction form
   1,620.42/2,229.57 = 1,583.57/x
3. Step 3: Cross multiply
   1,620.42x = 2,229.57 × 1,583.57
4. Step 4: Simplify right side
   1,620.42x = 3,530,669.02
5. Step 5: Solve for x
   x = 3,530,669.02/1,620.42
6. Step 6: Final answer
   x = 2,178.86