Finding the Fourth Proportional to 21,624.48, 29,841.89 and 12,672.05

Step by Step Solution

1. Step 1: Write the proportion equation
   21,624.48 : 29,841.89 = 12,672.05 : x
2. Step 2: Convert to fraction form
   21,624.48/29,841.89 = 12,672.05/x
3. Step 3: Cross multiply
   21,624.48x = 29,841.89 × 12,672.05
4. Step 4: Simplify right side
   21,624.48x = 378,157,709.60
5. Step 5: Solve for x
   x = 378,157,709.60/21,624.48
6. Step 6: Final answer
   x = 17,487.48