Finding the Fourth Proportional to 10,991.15, 15,167.79 and 5,955.38

Step by Step Solution

1. Step 1: Write the proportion equation
   10,991.15 : 15,167.79 = 5,955.38 : x
2. Step 2: Convert to fraction form
   10,991.15/15,167.79 = 5,955.38/x
3. Step 3: Cross multiply
   10,991.15x = 15,167.79 × 5,955.38
4. Step 4: Simplify right side
   10,991.15x = 90,329,953.21
5. Step 5: Solve for x
   x = 90,329,953.21/10,991.15
6. Step 6: Final answer
   x = 8,218.43