Finding the Fourth Proportional to 2,217.72, 3,323.68 and 1,121.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,217.72 : 3,323.68 = 1,121.50 : x
2. Step 2: Convert to fraction form
   2,217.72/3,323.68 = 1,121.50/x
3. Step 3: Cross multiply
   2,217.72x = 3,323.68 × 1,121.50
4. Step 4: Simplify right side
   2,217.72x = 3,727,507.12
5. Step 5: Solve for x
   x = 3,727,507.12/2,217.72
6. Step 6: Final answer
   x = 1,680.78