Finding the Fourth Proportional to 21,085.84, 31,601.49 and 8,591.32

Step by Step Solution

1. Step 1: Write the proportion equation
   21,085.84 : 31,601.49 = 8,591.32 : x
2. Step 2: Convert to fraction form
   21,085.84/31,601.49 = 8,591.32/x
3. Step 3: Cross multiply
   21,085.84x = 31,601.49 × 8,591.32
4. Step 4: Simplify right side
   21,085.84x = 271,498,513.07
5. Step 5: Solve for x
   x = 271,498,513.07/21,085.84
6. Step 6: Final answer
   x = 12,875.87