Finding the Fourth Proportional to 10,957.11, 15,120.81 and 5,921.33

Step by Step Solution

1. Step 1: Write the proportion equation
   10,957.11 : 15,120.81 = 5,921.33 : x
2. Step 2: Convert to fraction form
   10,957.11/15,120.81 = 5,921.33/x
3. Step 3: Cross multiply
   10,957.11x = 15,120.81 × 5,921.33
4. Step 4: Simplify right side
   10,957.11x = 89,535,261.10
5. Step 5: Solve for x
   x = 89,535,261.10/10,957.11
6. Step 6: Final answer
   x = 8,171.43