Finding the Fourth Proportional to 21,069.39, 31,605.90 and 5,487

Step by Step Solution

1. Step 1: Write the proportion equation
   21,069.39 : 31,605.90 = 5,487 : x
2. Step 2: Convert to fraction form
   21,069.39/31,605.90 = 5,487/x
3. Step 3: Cross multiply
   21,069.39x = 31,605.90 × 5,487
4. Step 4: Simplify right side
   21,069.39x = 173,421,573.30
5. Step 5: Solve for x
   x = 173,421,573.30/21,069.39
6. Step 6: Final answer
   x = 8,230.97