Finding the Fourth Proportional to 21,105.25, 31,646.17 and 8,634.03

Step by Step Solution

1. Step 1: Write the proportion equation
   21,105.25 : 31,646.17 = 8,634.03 : x
2. Step 2: Convert to fraction form
   21,105.25/31,646.17 = 8,634.03/x
3. Step 3: Cross multiply
   21,105.25x = 31,646.17 × 8,634.03
4. Step 4: Simplify right side
   21,105.25x = 273,233,943.39
5. Step 5: Solve for x
   x = 273,233,943.39/21,105.25
6. Step 6: Final answer
   x = 12,946.26