Finding the Fourth Proportional to 21,196.37, 29,244.61 and 12,240.61

Step by Step Solution

1. Step 1: Write the proportion equation
   21,196.37 : 29,244.61 = 12,240.61 : x
2. Step 2: Convert to fraction form
   21,196.37/29,244.61 = 12,240.61/x
3. Step 3: Cross multiply
   21,196.37x = 29,244.61 × 12,240.61
4. Step 4: Simplify right side
   21,196.37x = 357,971,865.61
5. Step 5: Solve for x
   x = 357,971,865.61/21,196.37
6. Step 6: Final answer
   x = 16,888.36