Finding the Fourth Proportional to 13,724.34, 18,939.62 and 7,436.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,724.34 : 18,939.62 = 7,436.72 : x
2. Step 2: Convert to fraction form
   13,724.34/18,939.62 = 7,436.72/x
3. Step 3: Cross multiply
   13,724.34x = 18,939.62 × 7,436.72
4. Step 4: Simplify right side
   13,724.34x = 140,848,650.85
5. Step 5: Solve for x
   x = 140,848,650.85/13,724.34
6. Step 6: Final answer
   x = 10,262.69