Finding the Fourth Proportional to 20,904.28, 31,353.18 and 6,109.72

Step by Step Solution

1. Step 1: Write the proportion equation
   20,904.28 : 31,353.18 = 6,109.72 : x
2. Step 2: Convert to fraction form
   20,904.28/31,353.18 = 6,109.72/x
3. Step 3: Cross multiply
   20,904.28x = 31,353.18 × 6,109.72
4. Step 4: Simplify right side
   20,904.28x = 191,559,150.91
5. Step 5: Solve for x
   x = 191,559,150.91/20,904.28
6. Step 6: Final answer
   x = 9,163.63