Finding the Fourth Proportional to 21,941.79, 30,271.82 and 13,440.84

Step by Step Solution

1. Step 1: Write the proportion equation
   21,941.79 : 30,271.82 = 13,440.84 : x
2. Step 2: Convert to fraction form
   21,941.79/30,271.82 = 13,440.84/x
3. Step 3: Cross multiply
   21,941.79x = 30,271.82 × 13,440.84
4. Step 4: Simplify right side
   21,941.79x = 406,878,689.13
5. Step 5: Solve for x
   x = 406,878,689.13/21,941.79
6. Step 6: Final answer
   x = 18,543.55