Finding the Fourth Proportional to 11,945.48, 17,920.48 and 3,940.73

Step by Step Solution

1. Step 1: Write the proportion equation
   11,945.48 : 17,920.48 = 3,940.73 : x
2. Step 2: Convert to fraction form
   11,945.48/17,920.48 = 3,940.73/x
3. Step 3: Cross multiply
   11,945.48x = 17,920.48 × 3,940.73
4. Step 4: Simplify right side
   11,945.48x = 70,619,692.34
5. Step 5: Solve for x
   x = 70,619,692.34/11,945.48
6. Step 6: Final answer
   x = 5,911.84