Finding the Fourth Proportional to 21,150.24, 29,187.72 and 12,771.60

Step by Step Solution

1. Step 1: Write the proportion equation
   21,150.24 : 29,187.72 = 12,771.60 : x
2. Step 2: Convert to fraction form
   21,150.24/29,187.72 = 12,771.60/x
3. Step 3: Cross multiply
   21,150.24x = 29,187.72 × 12,771.60
4. Step 4: Simplify right side
   21,150.24x = 372,773,884.75
5. Step 5: Solve for x
   x = 372,773,884.75/21,150.24
6. Step 6: Final answer
   x = 17,625.04