Finding the Fourth Proportional to 2,217.72, 3,320.10 and 1,601.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,217.72 : 3,320.10 = 1,601.40 : x
2. Step 2: Convert to fraction form
   2,217.72/3,320.10 = 1,601.40/x
3. Step 3: Cross multiply
   2,217.72x = 3,320.10 × 1,601.40
4. Step 4: Simplify right side
   2,217.72x = 5,316,808.14
5. Step 5: Solve for x
   x = 5,316,808.14/2,217.72
6. Step 6: Final answer
   x = 2,397.42