Finding the Fourth Proportional to 2,403.55, 3,318.20 and 1,661.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,403.55 : 3,318.20 = 1,661.50 : x
2. Step 2: Convert to fraction form
   2,403.55/3,318.20 = 1,661.50/x
3. Step 3: Cross multiply
   2,403.55x = 3,318.20 × 1,661.50
4. Step 4: Simplify right side
   2,403.55x = 5,513,189.30
5. Step 5: Solve for x
   x = 5,513,189.30/2,403.55
6. Step 6: Final answer
   x = 2,293.77