Finding the Fourth Proportional to 21,765.90, 30,042.27 and 13,272.69

Step by Step Solution

1. Step 1: Write the proportion equation
   21,765.90 : 30,042.27 = 13,272.69 : x
2. Step 2: Convert to fraction form
   21,765.90/30,042.27 = 13,272.69/x
3. Step 3: Cross multiply
   21,765.90x = 30,042.27 × 13,272.69
4. Step 4: Simplify right side
   21,765.90x = 398,741,736.61
5. Step 5: Solve for x
   x = 398,741,736.61/21,765.90
6. Step 6: Final answer
   x = 18,319.56