Finding the Fourth Proportional to 14,218.43, 21,328.72 and 10,891.49

Step by Step Solution

1. Step 1: Write the proportion equation
   14,218.43 : 21,328.72 = 10,891.49 : x
2. Step 2: Convert to fraction form
   14,218.43/21,328.72 = 10,891.49/x
3. Step 3: Cross multiply
   14,218.43x = 21,328.72 × 10,891.49
4. Step 4: Simplify right side
   14,218.43x = 232,301,406.72
5. Step 5: Solve for x
   x = 232,301,406.72/14,218.43
6. Step 6: Final answer
   x = 16,338.05