Finding the Fourth Proportional to 2,390.61, 3,300.57 and 1,644.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,390.61 : 3,300.57 = 1,644.33 : x
2. Step 2: Convert to fraction form
   2,390.61/3,300.57 = 1,644.33/x
3. Step 3: Cross multiply
   2,390.61x = 3,300.57 × 1,644.33
4. Step 4: Simplify right side
   2,390.61x = 5,427,226.27
5. Step 5: Solve for x
   x = 5,427,226.27/2,390.61
6. Step 6: Final answer
   x = 2,270.23