Finding the Fourth Proportional to 8,128.87, 12,195.43 and 3,449.09

Step by Step Solution

1. Step 1: Write the proportion equation
   8,128.87 : 12,195.43 = 3,449.09 : x
2. Step 2: Convert to fraction form
   8,128.87/12,195.43 = 3,449.09/x
3. Step 3: Cross multiply
   8,128.87x = 12,195.43 × 3,449.09
4. Step 4: Simplify right side
   8,128.87x = 42,063,157.52
5. Step 5: Solve for x
   x = 42,063,157.52/8,128.87
6. Step 6: Final answer
   x = 5,174.54