Finding the Fourth Proportional to 11,960.18, 16,487.77 and 7,920.25

Step by Step Solution

1. Step 1: Write the proportion equation
   11,960.18 : 16,487.77 = 7,920.25 : x
2. Step 2: Convert to fraction form
   11,960.18/16,487.77 = 7,920.25/x
3. Step 3: Cross multiply
   11,960.18x = 16,487.77 × 7,920.25
4. Step 4: Simplify right side
   11,960.18x = 130,587,260.34
5. Step 5: Solve for x
   x = 130,587,260.34/11,960.18
6. Step 6: Final answer
   x = 10,918.50