Finding the Fourth Proportional to 13,724.46, 18,939.78 and 7,436.79

Step by Step Solution

1. Step 1: Write the proportion equation
   13,724.46 : 18,939.78 = 7,436.79 : x
2. Step 2: Convert to fraction form
   13,724.46/18,939.78 = 7,436.79/x
3. Step 3: Cross multiply
   13,724.46x = 18,939.78 × 7,436.79
4. Step 4: Simplify right side
   13,724.46x = 140,851,166.51
5. Step 5: Solve for x
   x = 140,851,166.51/13,724.46
6. Step 6: Final answer
   x = 10,262.78