Finding the Fourth Proportional to 21,150.72, 29,187.72 and 11,719.08

Step by Step Solution

1. Step 1: Write the proportion equation
   21,150.72 : 29,187.72 = 11,719.08 : x
2. Step 2: Convert to fraction form
   21,150.72/29,187.72 = 11,719.08/x
3. Step 3: Cross multiply
   21,150.72x = 29,187.72 × 11,719.08
4. Step 4: Simplify right side
   21,150.72x = 342,053,225.70
5. Step 5: Solve for x
   x = 342,053,225.70/21,150.72
6. Step 6: Final answer
   x = 16,172.18