Finding the Fourth Proportional to 21,279.12, 31,938.12 and 16,332.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,279.12 : 31,938.12 = 16,332.72 : x
2. Step 2: Convert to fraction form
   21,279.12/31,938.12 = 16,332.72/x
3. Step 3: Cross multiply
   21,279.12x = 31,938.12 × 16,332.72
4. Step 4: Simplify right side
   21,279.12x = 521,636,371.29
5. Step 5: Solve for x
   x = 521,636,371.29/21,279.12
6. Step 6: Final answer
   x = 24,514.00