Finding the Fourth Proportional to 11,411.74, 17,120.34 and 3,620.55

Step by Step Solution

1. Step 1: Write the proportion equation
   11,411.74 : 17,120.34 = 3,620.55 : x
2. Step 2: Convert to fraction form
   11,411.74/17,120.34 = 3,620.55/x
3. Step 3: Cross multiply
   11,411.74x = 17,120.34 × 3,620.55
4. Step 4: Simplify right side
   11,411.74x = 61,985,046.99
5. Step 5: Solve for x
   x = 61,985,046.99/11,411.74
6. Step 6: Final answer
   x = 5,431.69