Finding the Fourth Proportional to 14,340.42, 19,809.72 and 13,639.78

Step by Step Solution

1. Step 1: Write the proportion equation
   14,340.42 : 19,809.72 = 13,639.78 : x
2. Step 2: Convert to fraction form
   14,340.42/19,809.72 = 13,639.78/x
3. Step 3: Cross multiply
   14,340.42x = 19,809.72 × 13,639.78
4. Step 4: Simplify right side
   14,340.42x = 270,200,222.66
5. Step 5: Solve for x
   x = 270,200,222.66/14,340.42
6. Step 6: Final answer
   x = 18,841.86