Finding the Fourth Proportional to 21,757.58, 30,022.76 and 13,256.61

Step by Step Solution

1. Step 1: Write the proportion equation
   21,757.58 : 30,022.76 = 13,256.61 : x
2. Step 2: Convert to fraction form
   21,757.58/30,022.76 = 13,256.61/x
3. Step 3: Cross multiply
   21,757.58x = 30,022.76 × 13,256.61
4. Step 4: Simplify right side
   21,757.58x = 397,999,941.00
5. Step 5: Solve for x
   x = 397,999,941.00/21,757.58
6. Step 6: Final answer
   x = 18,292.47