Finding the Fourth Proportional to 21,653.52, 29,878.20 and 12,222.96

Step by Step Solution

1. Step 1: Write the proportion equation
   21,653.52 : 29,878.20 = 12,222.96 : x
2. Step 2: Convert to fraction form
   21,653.52/29,878.20 = 12,222.96/x
3. Step 3: Cross multiply
   21,653.52x = 29,878.20 × 12,222.96
4. Step 4: Simplify right side
   21,653.52x = 365,200,043.47
5. Step 5: Solve for x
   x = 365,200,043.47/21,653.52
6. Step 6: Final answer
   x = 16,865.62