Finding the Fourth Proportional to 11,921.94, 16,456.91 and 7,954.61

Step by Step Solution

1. Step 1: Write the proportion equation
   11,921.94 : 16,456.91 = 7,954.61 : x
2. Step 2: Convert to fraction form
   11,921.94/16,456.91 = 7,954.61/x
3. Step 3: Cross multiply
   11,921.94x = 16,456.91 × 7,954.61
4. Step 4: Simplify right side
   11,921.94x = 130,908,178.80
5. Step 5: Solve for x
   x = 130,908,178.80/11,921.94
6. Step 6: Final answer
   x = 10,980.44