Finding the Fourth Proportional to 8,958.91, 13,438.50 and 3,115.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,958.91 : 13,438.50 = 3,115.72 : x
2. Step 2: Convert to fraction form
   8,958.91/13,438.50 = 3,115.72/x
3. Step 3: Cross multiply
   8,958.91x = 13,438.50 × 3,115.72
4. Step 4: Simplify right side
   8,958.91x = 41,870,603.22
5. Step 5: Solve for x
   x = 41,870,603.22/8,958.91
6. Step 6: Final answer
   x = 4,673.63