Finding the Fourth Proportional to 10,958.09, 15,223.55 and 10,855.62

Step by Step Solution

1. Step 1: Write the proportion equation
   10,958.09 : 15,223.55 = 10,855.62 : x
2. Step 2: Convert to fraction form
   10,958.09/15,223.55 = 10,855.62/x
3. Step 3: Cross multiply
   10,958.09x = 15,223.55 × 10,855.62
4. Step 4: Simplify right side
   10,958.09x = 165,261,019.57
5. Step 5: Solve for x
   x = 165,261,019.57/10,958.09
6. Step 6: Final answer
   x = 15,081.20