Finding the Fourth Proportional to 10,957.69, 15,121.59 and 5,921.91

Step by Step Solution

1. Step 1: Write the proportion equation
   10,957.69 : 15,121.59 = 5,921.91 : x
2. Step 2: Convert to fraction form
   10,957.69/15,121.59 = 5,921.91/x
3. Step 3: Cross multiply
   10,957.69x = 15,121.59 × 5,921.91
4. Step 4: Simplify right side
   10,957.69x = 89,548,695.04
5. Step 5: Solve for x
   x = 89,548,695.04/10,957.69
6. Step 6: Final answer
   x = 8,172.22