Finding the Fourth Proportional to 21,222.72, 29,289.10 and 13,684.74

Step by Step Solution

1. Step 1: Write the proportion equation
   21,222.72 : 29,289.10 = 13,684.74 : x
2. Step 2: Convert to fraction form
   21,222.72/29,289.10 = 13,684.74/x
3. Step 3: Cross multiply
   21,222.72x = 29,289.10 × 13,684.74
4. Step 4: Simplify right side
   21,222.72x = 400,813,718.33
5. Step 5: Solve for x
   x = 400,813,718.33/21,222.72
6. Step 6: Final answer
   x = 18,886.07