Finding the Fourth Proportional to 11,005.74, 16,510.91 and 3,609.61

Step by Step Solution

1. Step 1: Write the proportion equation
   11,005.74 : 16,510.91 = 3,609.61 : x
2. Step 2: Convert to fraction form
   11,005.74/16,510.91 = 3,609.61/x
3. Step 3: Cross multiply
   11,005.74x = 16,510.91 × 3,609.61
4. Step 4: Simplify right side
   11,005.74x = 59,597,945.85
5. Step 5: Solve for x
   x = 59,597,945.85/11,005.74
6. Step 6: Final answer
   x = 5,415.17