Finding the Fourth Proportional to 21,150.74, 31,665.63 and 14,212.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,150.74 : 31,665.63 = 14,212.82 : x
2. Step 2: Convert to fraction form
   21,150.74/31,665.63 = 14,212.82/x
3. Step 3: Cross multiply
   21,150.74x = 31,665.63 × 14,212.82
4. Step 4: Simplify right side
   21,150.74x = 450,057,899.38
5. Step 5: Solve for x
   x = 450,057,899.38/21,150.74
6. Step 6: Final answer
   x = 21,278.59