Finding the Fourth Proportional to 21,315.29, 31,963.22 and 13,806.59

Step by Step Solution

1. Step 1: Write the proportion equation
   21,315.29 : 31,963.22 = 13,806.59 : x
2. Step 2: Convert to fraction form
   21,315.29/31,963.22 = 13,806.59/x
3. Step 3: Cross multiply
   21,315.29x = 31,963.22 × 13,806.59
4. Step 4: Simplify right side
   21,315.29x = 441,303,084.49
5. Step 5: Solve for x
   x = 441,303,084.49/21,315.29
6. Step 6: Final answer
   x = 20,703.59