Finding the Fourth Proportional to 21,151.20, 29,191.72 and 12,196.92

Step by Step Solution

1. Step 1: Write the proportion equation
   21,151.20 : 29,191.72 = 12,196.92 : x
2. Step 2: Convert to fraction form
   21,151.20/29,191.72 = 12,196.92/x
3. Step 3: Cross multiply
   21,151.20x = 29,191.72 × 12,196.92
4. Step 4: Simplify right side
   21,151.20x = 356,049,073.50
5. Step 5: Solve for x
   x = 356,049,073.50/21,151.20
6. Step 6: Final answer
   x = 16,833.52