Finding the Fourth Proportional to 11,518.10, 17,286.88 and 7,958.15

Step by Step Solution

1. Step 1: Write the proportion equation
   11,518.10 : 17,286.88 = 7,958.15 : x
2. Step 2: Convert to fraction form
   11,518.10/17,286.88 = 7,958.15/x
3. Step 3: Cross multiply
   11,518.10x = 17,286.88 × 7,958.15
4. Step 4: Simplify right side
   11,518.10x = 137,571,607.39
5. Step 5: Solve for x
   x = 137,571,607.39/11,518.10
6. Step 6: Final answer
   x = 11,943.95