Finding the Fourth Proportional to 11,620.78, 17,431.24 and 3,300.54

Step by Step Solution

1. Step 1: Write the proportion equation
   11,620.78 : 17,431.24 = 3,300.54 : x
2. Step 2: Convert to fraction form
   11,620.78/17,431.24 = 3,300.54/x
3. Step 3: Cross multiply
   11,620.78x = 17,431.24 × 3,300.54
4. Step 4: Simplify right side
   11,620.78x = 57,532,504.87
5. Step 5: Solve for x
   x = 57,532,504.87/11,620.78
6. Step 6: Final answer
   x = 4,950.83