Finding the Fourth Proportional to 21,711.81, 29,963.52 and 12,151.47

Step by Step Solution

1. Step 1: Write the proportion equation
   21,711.81 : 29,963.52 = 12,151.47 : x
2. Step 2: Convert to fraction form
   21,711.81/29,963.52 = 12,151.47/x
3. Step 3: Cross multiply
   21,711.81x = 29,963.52 × 12,151.47
4. Step 4: Simplify right side
   21,711.81x = 364,100,814.37
5. Step 5: Solve for x
   x = 364,100,814.37/21,711.81
6. Step 6: Final answer
   x = 16,769.71