Finding the Fourth Proportional to 21,189.20, 31,783.98 and 5,394.24

Step by Step Solution

1. Step 1: Write the proportion equation
   21,189.20 : 31,783.98 = 5,394.24 : x
2. Step 2: Convert to fraction form
   21,189.20/31,783.98 = 5,394.24/x
3. Step 3: Cross multiply
   21,189.20x = 31,783.98 × 5,394.24
4. Step 4: Simplify right side
   21,189.20x = 171,450,416.28
5. Step 5: Solve for x
   x = 171,450,416.28/21,189.20
6. Step 6: Final answer
   x = 8,091.41