Finding the Fourth Proportional to 21,185.28, 31,771.83 and 8,535

Step by Step Solution

1. Step 1: Write the proportion equation
   21,185.28 : 31,771.83 = 8,535 : x
2. Step 2: Convert to fraction form
   21,185.28/31,771.83 = 8,535/x
3. Step 3: Cross multiply
   21,185.28x = 31,771.83 × 8,535
4. Step 4: Simplify right side
   21,185.28x = 271,172,569.05
5. Step 5: Solve for x
   x = 271,172,569.05/21,185.28
6. Step 6: Final answer
   x = 12,800.05