Finding the Fourth Proportional to 21,680.82, 32,558.34 and 13,409.76

Step by Step Solution

1. Step 1: Write the proportion equation
   21,680.82 : 32,558.34 = 13,409.76 : x
2. Step 2: Convert to fraction form
   21,680.82/32,558.34 = 13,409.76/x
3. Step 3: Cross multiply
   21,680.82x = 32,558.34 × 13,409.76
4. Step 4: Simplify right side
   21,680.82x = 436,599,525.40
5. Step 5: Solve for x
   x = 436,599,525.40/21,680.82
6. Step 6: Final answer
   x = 20,137.59