Finding the Fourth Proportional to 8,158.19, 12,238.86 and 3,478.12

Step by Step Solution

1. Step 1: Write the proportion equation
   8,158.19 : 12,238.86 = 3,478.12 : x
2. Step 2: Convert to fraction form
   8,158.19/12,238.86 = 3,478.12/x
3. Step 3: Cross multiply
   8,158.19x = 12,238.86 × 3,478.12
4. Step 4: Simplify right side
   8,158.19x = 42,568,223.74
5. Step 5: Solve for x
   x = 42,568,223.74/8,158.19
6. Step 6: Final answer
   x = 5,217.85