Finding the Fourth Proportional to 21,132, 29,155.10 and 12,179.34

Step by Step Solution

1. Step 1: Write the proportion equation
   21,132 : 29,155.10 = 12,179.34 : x
2. Step 2: Convert to fraction form
   21,132/29,155.10 = 12,179.34/x
3. Step 3: Cross multiply
   21,132x = 29,155.10 × 12,179.34
4. Step 4: Simplify right side
   21,132x = 355,089,814.74
5. Step 5: Solve for x
   x = 355,089,814.74/21,132
6. Step 6: Final answer
   x = 16,803.42