Finding the Fourth Proportional to 21,300.21, 29,375.19 and 13,343.31

Step by Step Solution

1. Step 1: Write the proportion equation
   21,300.21 : 29,375.19 = 13,343.31 : x
2. Step 2: Convert to fraction form
   21,300.21/29,375.19 = 13,343.31/x
3. Step 3: Cross multiply
   21,300.21x = 29,375.19 × 13,343.31
4. Step 4: Simplify right side
   21,300.21x = 391,962,266.48
5. Step 5: Solve for x
   x = 391,962,266.48/21,300.21
6. Step 6: Final answer
   x = 18,401.80