Finding the Fourth Proportional to 6,109.72, 8,431.39 and 3,315.22

Step by Step Solution

1. Step 1: Write the proportion equation
   6,109.72 : 8,431.39 = 3,315.22 : x
2. Step 2: Convert to fraction form
   6,109.72/8,431.39 = 3,315.22/x
3. Step 3: Cross multiply
   6,109.72x = 8,431.39 × 3,315.22
4. Step 4: Simplify right side
   6,109.72x = 27,951,912.76
5. Step 5: Solve for x
   x = 27,951,912.76/6,109.72
6. Step 6: Final answer
   x = 4,574.99