Finding the Fourth Proportional to 21,539.34, 29,725.92 and 12,109.32

Step by Step Solution

1. Step 1: Write the proportion equation
   21,539.34 : 29,725.92 = 12,109.32 : x
2. Step 2: Convert to fraction form
   21,539.34/29,725.92 = 12,109.32/x
3. Step 3: Cross multiply
   21,539.34x = 29,725.92 × 12,109.32
4. Step 4: Simplify right side
   21,539.34x = 359,960,677.57
5. Step 5: Solve for x
   x = 359,960,677.57/21,539.34
6. Step 6: Final answer
   x = 16,711.78