Finding the Fourth Proportional to 10,991.91, 15,168.81 and 5,956.13

Step by Step Solution

1. Step 1: Write the proportion equation
   10,991.91 : 15,168.81 = 5,956.13 : x
2. Step 2: Convert to fraction form
   10,991.91/15,168.81 = 5,956.13/x
3. Step 3: Cross multiply
   10,991.91x = 15,168.81 × 5,956.13
4. Step 4: Simplify right side
   10,991.91x = 90,347,328.46
5. Step 5: Solve for x
   x = 90,347,328.46/10,991.91
6. Step 6: Final answer
   x = 8,219.44