Finding the Fourth Proportional to 11,959.86, 17,940.78 and 3,640.62

Step by Step Solution

1. Step 1: Write the proportion equation
   11,959.86 : 17,940.78 = 3,640.62 : x
2. Step 2: Convert to fraction form
   11,959.86/17,940.78 = 3,640.62/x
3. Step 3: Cross multiply
   11,959.86x = 17,940.78 × 3,640.62
4. Step 4: Simplify right side
   11,959.86x = 65,315,562.48
5. Step 5: Solve for x
   x = 65,315,562.48/11,959.86
6. Step 6: Final answer
   x = 5,461.23