Finding the Fourth Proportional to 21,069.12, 31,605.52 and 5,486.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,069.12 : 31,605.52 = 5,486.72 : x
2. Step 2: Convert to fraction form
   21,069.12/31,605.52 = 5,486.72/x
3. Step 3: Cross multiply
   21,069.12x = 31,605.52 × 5,486.72
4. Step 4: Simplify right side
   21,069.12x = 173,410,638.69
5. Step 5: Solve for x
   x = 173,410,638.69/21,069.12
6. Step 6: Final answer
   x = 8,230.56