Finding the Fourth Proportional to 21,012.43, 31,517.95 and 8,532.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,012.43 : 31,517.95 = 8,532.15 : x
2. Step 2: Convert to fraction form
   21,012.43/31,517.95 = 8,532.15/x
3. Step 3: Cross multiply
   21,012.43x = 31,517.95 × 8,532.15
4. Step 4: Simplify right side
   21,012.43x = 268,915,877.09
5. Step 5: Solve for x
   x = 268,915,877.09/21,012.43
6. Step 6: Final answer
   x = 12,797.94