Finding the Fourth Proportional to 2,328.72, 3,209.40 and 1,665.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,328.72 : 3,209.40 = 1,665.60 : x
2. Step 2: Convert to fraction form
   2,328.72/3,209.40 = 1,665.60/x
3. Step 3: Cross multiply
   2,328.72x = 3,209.40 × 1,665.60
4. Step 4: Simplify right side
   2,328.72x = 5,345,576.64
5. Step 5: Solve for x
   x = 5,345,576.64/2,328.72
6. Step 6: Final answer
   x = 2,295.50