Finding the Fourth Proportional to 21,909.82, 30,224.67 and 12,952.96

Step by Step Solution

1. Step 1: Write the proportion equation
   21,909.82 : 30,224.67 = 12,952.96 : x
2. Step 2: Convert to fraction form
   21,909.82/30,224.67 = 12,952.96/x
3. Step 3: Cross multiply
   21,909.82x = 30,224.67 × 12,952.96
4. Step 4: Simplify right side
   21,909.82x = 391,498,941.52
5. Step 5: Solve for x
   x = 391,498,941.52/21,909.82
6. Step 6: Final answer
   x = 17,868.65