Finding the Fourth Proportional to 21,941.41, 30,279.30 and 13,443.55

Step by Step Solution

1. Step 1: Write the proportion equation
   21,941.41 : 30,279.30 = 13,443.55 : x
2. Step 2: Convert to fraction form
   21,941.41/30,279.30 = 13,443.55/x
3. Step 3: Cross multiply
   21,941.41x = 30,279.30 × 13,443.55
4. Step 4: Simplify right side
   21,941.41x = 407,061,216.30
5. Step 5: Solve for x
   x = 407,061,216.30/21,941.41
6. Step 6: Final answer
   x = 18,552.19