Finding the Fourth Proportional to 21,039.50, 31,559.49 and 5,456.18

Step by Step Solution

1. Step 1: Write the proportion equation
   21,039.50 : 31,559.49 = 5,456.18 : x
2. Step 2: Convert to fraction form
   21,039.50/31,559.49 = 5,456.18/x
3. Step 3: Cross multiply
   21,039.50x = 31,559.49 × 5,456.18
4. Step 4: Simplify right side
   21,039.50x = 172,194,258.15
5. Step 5: Solve for x
   x = 172,194,258.15/21,039.50
6. Step 6: Final answer
   x = 8,184.33