Finding the Fourth Proportional to 11,105.74, 15,318.40 and 7,131.68

Step by Step Solution

1. Step 1: Write the proportion equation
   11,105.74 : 15,318.40 = 7,131.68 : x
2. Step 2: Convert to fraction form
   11,105.74/15,318.40 = 7,131.68/x
3. Step 3: Cross multiply
   11,105.74x = 15,318.40 × 7,131.68
4. Step 4: Simplify right side
   11,105.74x = 109,245,926.91
5. Step 5: Solve for x
   x = 109,245,926.91/11,105.74
6. Step 6: Final answer
   x = 9,836.89