Finding the Fourth Proportional to 2,545.72, 3,511.92 and 1,661.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,545.72 : 3,511.92 = 1,661.20 : x
2. Step 2: Convert to fraction form
   2,545.72/3,511.92 = 1,661.20/x
3. Step 3: Cross multiply
   2,545.72x = 3,511.92 × 1,661.20
4. Step 4: Simplify right side
   2,545.72x = 5,834,001.50
5. Step 5: Solve for x
   x = 5,834,001.50/2,545.72
6. Step 6: Final answer
   x = 2,291.69