Finding the Fourth Proportional to 8,158.50, 12,239.37 and 3,478.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,158.50 : 12,239.37 = 3,478.50 : x
2. Step 2: Convert to fraction form
   8,158.50/12,239.37 = 3,478.50/x
3. Step 3: Cross multiply
   8,158.50x = 12,239.37 × 3,478.50
4. Step 4: Simplify right side
   8,158.50x = 42,574,648.55
5. Step 5: Solve for x
   x = 42,574,648.55/8,158.50
6. Step 6: Final answer
   x = 5,218.44