Finding the Fourth Proportional to 21,151.27, 29,191.81 and 12,196.99

Step by Step Solution

1. Step 1: Write the proportion equation
   21,151.27 : 29,191.81 = 12,196.99 : x
2. Step 2: Convert to fraction form
   21,151.27/29,191.81 = 12,196.99/x
3. Step 3: Cross multiply
   21,151.27x = 29,191.81 × 12,196.99
4. Step 4: Simplify right side
   21,151.27x = 356,052,068.69
5. Step 5: Solve for x
   x = 356,052,068.69/21,151.27
6. Step 6: Final answer
   x = 16,833.61