Finding the Fourth Proportional to 11,939.20, 16,476.06 and 7,222.12

Step by Step Solution

1. Step 1: Write the proportion equation
   11,939.20 : 16,476.06 = 7,222.12 : x
2. Step 2: Convert to fraction form
   11,939.20/16,476.06 = 7,222.12/x
3. Step 3: Cross multiply
   11,939.20x = 16,476.06 × 7,222.12
4. Step 4: Simplify right side
   11,939.20x = 118,992,082.45
5. Step 5: Solve for x
   x = 118,992,082.45/11,939.20
6. Step 6: Final answer
   x = 9,966.50