Finding the Fourth Proportional to 21,086.88, 31,621.60 and 8,598.43

Step by Step Solution

1. Step 1: Write the proportion equation
   21,086.88 : 31,621.60 = 8,598.43 : x
2. Step 2: Convert to fraction form
   21,086.88/31,621.60 = 8,598.43/x
3. Step 3: Cross multiply
   21,086.88x = 31,621.60 × 8,598.43
4. Step 4: Simplify right side
   21,086.88x = 271,896,114.09
5. Step 5: Solve for x
   x = 271,896,114.09/21,086.88
6. Step 6: Final answer
   x = 12,894.09