Finding the Fourth Proportional to 21,087.36, 31,632.90 and 5,505

Step by Step Solution

1. Step 1: Write the proportion equation
   21,087.36 : 31,632.90 = 5,505 : x
2. Step 2: Convert to fraction form
   21,087.36/31,632.90 = 5,505/x
3. Step 3: Cross multiply
   21,087.36x = 31,632.90 × 5,505
4. Step 4: Simplify right side
   21,087.36x = 174,139,114.50
5. Step 5: Solve for x
   x = 174,139,114.50/21,087.36
6. Step 6: Final answer
   x = 8,257.99