Finding the Fourth Proportional to 13,724.42, 18,939.66 and 7,436.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,724.42 : 18,939.66 = 7,436.78 : x
2. Step 2: Convert to fraction form
   13,724.42/18,939.66 = 7,436.78/x
3. Step 3: Cross multiply
   13,724.42x = 18,939.66 × 7,436.78
4. Step 4: Simplify right side
   13,724.42x = 140,850,084.69
5. Step 5: Solve for x
   x = 140,850,084.69/13,724.42
6. Step 6: Final answer
   x = 10,262.73